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Home→Published 2009 → September

Monthly Archives: September 2009

The device may be required to boot up the computer

Computer Aid Posted on 29 September, 2009 by Luigi Martin29 September, 2009

I just had a problem very similar to the one mentioned at: http://www.computer-aid.com.au/blog/2009/03/17/realtek-device-co-installer-is-invalid/

Once again, I was unable to uninstall a badly installed device driver (audio device driver).

Except this time, I had no prior disk image to revert to… it was a brand-new PC…

After quite some searching, I found an excellent solution at: http://thetechcorner.net/2008/01/11/windows-driver-uninstall-failed-to-uninstall-the-device-the-device-may-be-required-to-boot-up-the-computer/

This solution involves editing the windows registry, so be aware that incorrectly changing the registry could ruin your computer.

In short:

You go to device manager (via control panel -> administrative tools)

You look at the properties of the uninstallable device, in particular, the details tab… write down the weird string that looks something like: HDAUDIOFUNC_01&VEN_10EC&DEV_0888&SUBSYS_8086D608&REV_10004&3ACC46D&080201

You then start regedit, and go to: HKLMsystemCurrentControlSetEnum

under enum, you need to find a folder that matches part of the string you wrote down.

In this case, I found FUNC…

I then deleted the folder below FUNC…, but only the one that matched the rest of the string. Sometimes there is only 1 subfolder… but if there isn’t, then you must make sure you delete the correct one!

Once deleted, I restarted the PC, cancelled all the found new hardware prompts, and ran the installer from the motherboard drivers CD…

And this time it worked correctly 🙂

Posted in Technical | Tagged uninstall driver

reprap: how to photocopy your own photocopier!

Computer Aid Posted on 27 September, 2009 by Luigi Martin27 September, 2009

I stumbled across this amazing site: RepRap

Its basically a machine that can currently create 60% of its own parts (In a manner of speaking: a photocopier that can almost photocopy itself)

Students Union Reception

Besides the implications on the manufacture of certain goods (and scaremongers fear of being one step closer to a terminator-style skynet ), it reminded me of an amusing “joke” I read, on usenet, many years ago:

New Xerox copier wreaks havoc

New Xerox copier wreaks havoc

by Pete Repeat

Xerox officials held an emergency press conference on Thursday to announce a total recall of all Reprotron 5000 Three-Dimensional Copy Machines.

Xerox stock has plummeted to a new all-time low since the release of the innovative device.

Xerox hailed the Reprotron 5000 as a “new revolution in copying” when it introduced the machine just two weeks ago, and market insiders were certain that the copier would send Xerox stock through the roof.

At a demonstration of the Reprotron in August, Xerox staffers made full three-dimensional copies of an Oriental vase, a bowl of fruit, and a perfect red rose.

Reporters were invited to sample apples and oranges copied from the original fruit, though Xerox technicians did warn that the copied fruit might taste slightly of toner.

John Thompson (inventor of the Reprotron) stepped forward to make a copy of a Manhattan phone book, but accidentally copied his hand and forearm. He quickly disposed of the highly detailed, frantically wiggling half-limb as it slid out of the copier’s delivery slot.

But Xerox wasn’t ready for what happened next.

“We assumed that people would behave as responsible, thinking human beings with this copier, and obviously we were wrong,” Thompson states.

From all across the USA, reports have been filing in of the copier being used in what Thompson calls “sick, greedy ways.”

At a Copy Center in Austin, Texas, a couple was arrested for making 15 copies of their three-year-old son, Jeremy, and then refusing to pay for the copies, claiming that some of the new children were “smudged.” Local authorities were uncertain as to which charges should be pressed.

In Union City, Arizona, Treasury Department officials are investigating reports of a secretary who allegedly copied a single bar of gold bullion 150 times. A task force investigator stated, “Granted, it takes money to make money, but we’re almost certain that this action is in violation of some laws.”

Xerox officials are also under fire from consumers, due to rumours that the three-dimensional copying technology is imperfect. Harold Butz of Peoria, Pennsylvania, made a copy of a common cement brick spray-painted gold. Butz claims he was “shocked and dismayed” when he discovered that the machine-made copy was 22-carat solid gold. “All I wanted was a really good copy of a cement brick spray-painted gold'” Butz stated. “What the hell am I going to do with this thing?”

Xerox plans to scrap all the machines they are able to recall, but Thompson expressed concern over the so-called “black market Reprotrons.” “Apparently some sick and greedy people discovered that if they had two machines, they could use one to make a working copy of the other,” Thompson revealed. “To tell the truth, we only sold two machines in all – to the Cappelli family, a New Jersey based Meat packing firm.

These copy pirates should be aware that as with anything that is copied from a copy and so on, there are bound to be defects in the copies produced. We have no idea what kind of stuff will pop out of the slot when a person copies something on a fourth- or fifth-generation machine.”

Thompson declined to comment on reports that hundreds of the pirated machines have a human thumb attached to the coin slot which constantly wiggles – the result of a person’s thumb getting in the way during one of the original copier-to-copier copies.

“Ultimately, we’re not too worried,” Thompson stated. “People owning the copiers will eventually run out of the fluid that make the machine work, and we’ve taken all the fluid off the market. A machine can only last two weeks or so without a fluid refill, and there won’t be any fluid refills.”

When asked why people with copiers couldn’t simply make copies of the fluid cannisters they already have, Xerox officials hastily ended the press conference, stating that they “need to reconsider a few things.”

Posted in Technical | Tagged repotron, reprap, self copying

microsoft feeds synchronization has encountered a problem

Computer Aid Posted on 25 September, 2009 by Luigi Martin25 September, 2009

After doing an XP repair install, I started getting this error:

microsoft feeds synchronization has encountered a problem and needs to close. We are sorry for the inconvenience.

I eventually found the cause:

rssIE 7 / IE8 had an RSS feed setup… poor old IE6 (after the “downgrade”), probably didn’t know how to handle feeds.

I found that the problem tends to go away after re-upgrading to IE8 again… but sometimes this doesn’t work.

In those cases, this is what you do:

Start IE8, go to tools -> Internet Options -> Content -> Feeds -> Settings -> untick all the boxes

If you want to start using feeds again, just remember to re-tick the boxes again.

Posted in Technical | Tagged feeds synchronization

Beware the quiet infections

Computer Aid Posted on 22 September, 2009 by Luigi Martin22 September, 2009

I’ve recently cloned a few drives for customers who have upgraded their computers via Computer Aid.

The process is simple enough: Clone the hard drive to the drive in the new computer, then a repair-install of XP, then a fix for internet explorer 7 / 8. After that, I might need to install XP SP3, plus any recent updates.

But lately, I’ve had a few problems, where either SP3 would generate an error, and back out, or IE 7 / 8 would not install, or sometimes, some other Microsoft updates (eg .net framework) would not install…

Very confusing until I do a malwarebytes’ scan and find a rootkit, or a trojan.

Whats worrying, is that infections seem to be on the rise, and worst of all, many are now so subtle, that you can barely know your computer is infected.

I found these particular infections, because I had to get the latest Microsoft updates… But I can see that many people, when faced with a failed Microsoft update, will just shrug their shoulders, and think to themselves: “its just a computer glitch… I’ll ignore it and it might go away in a few weeks time”.

Its ironic that the internet is a great way of expanding knowledge, yet it can also magnify the damage caused by ignorance…

Posted in Technical | Tagged infection, subtle

Error 1311. File not found: d:sku011.cab

Computer Aid Posted on 19 September, 2009 by Luigi Martin19 September, 2009

I was installing Microsoft Office 2007 on a computer, and part way through the install, I get:

Error 1311. File not found d:sku011.cab

Hmmm… I haven’t had this problem installing office before…

A quick search finds the usual, useless, help from microsoft. But I eventually find the cause:

Since the PC already has Office 2003 installed, Office 2007 decides to automatically upgrade the previous version of Office.

So, it wants “proof” that Office 2003 is installed (don’t ask… its Microsoft logic… even Microsoft don’t understand it 🙂 ). So it looks for a file that it knows must exists on the original Office 2003 install disks. ie sku011.cab

So where does it look for the file?

Why from its original installation location (drive D)… But drive D: has the office 2007 CD in it… so sku011.cab isn’t found…

office2007-logo

The solution?

When you get the error message, just put the original office 2003 CD in the drive, and the installation will continue.

I thought Office 2007 had “evolved” (as microsoft had heavily advertised)… Obviously not evolved enough to popup a message to say: “please insert the original Office 2003 CD, and press OK to continue”.

Posted in Technical | Tagged error 1311, office 2007, sku011.cab

WiFi (802.11G/N) signal strength

Computer Aid Posted on 16 September, 2009 by Luigi Martin16 September, 2009

WiFi is such a strange beast to work with.

I recently had a customer in a high-set house, who would have the internet dropout fairly often.

The setup was: adsl modem connected to a netgear WGR614 “G” wireless router, 2 WiFi laptops, and a PC downstairs which connected using Wifi (a netgear WG111 USB WiFi adapter).

The wireless router was located at one corner of the reasonable small house, the downstairs PC was almost directly below the router, and the two laptops are in the lounge-room, with the signal having to pass through about 4 thin walls.

I have a similar setup, and have no internet problems.

With the customer, the downstairs PC would work fine, but the two laptops would occasionally lose WiFi signal… When the signal was “re-acquired”, it would show a signal strength of  5 bars (ie very strong signal)…

I tried a few different channels, but that made no difference.

The customer eventually moved the router to a more central place in the house (the kitchen), just 1 room away from the lounge room.

Now, the laptops no longer lose the internet connection, but the downstairs PC can barely connect at all.

So I figure: a newer “N” wireless router should do the trick… lots more coverage, fewer dead spots.

wnr2000I install a Netgear WNR2000, but it ends up having similar coverage (and dead spots) as the WGR614 (despite my using a new WN111 USB wireless adapter in the downstairs PC…)

This is so strange, as the Laptops/PCs don’t detect any other neighboring WiFi signals that could also be causing interference.

I even tested the WNR2000 at home, and I was able to take my laptop down the street, and when I had about 2 houses between the laptop and the router, the signal started to drop out…

In the end, I could only guess that there is a lot of shielding / attenuation causing problems with the 802.11G/N radio signals.

The final solution: put the WiFi router in the kitchen, and get a tech to run a CAT5 Ethernet cable to the room downstairs.

Sometimes, you just can’t beat a wired networking solution!

Posted in Technical | Tagged 802.11g, 802.11N, signal strength, wifi

McAfee security suite – unknown computer detected

Computer Aid Posted on 13 September, 2009 by Luigi Martin13 September, 2009

I was diagnosing an intermittent WiFi fault with a laptop, when the company general manager wanders in and asks if I’m doing anything on the network.

I say, yes, I’ve put a new WiFi adapter in the laptop.

He say his McAfee just started warning him about an intrusion on the network…

So I go and take a look, and sure enough, his laptop is running McAfee security suite, and is saying that an unknown computer was found on the network.

Its easy enough for me to label the computer as trusted.

But I start to think: detecting unknown computers on a network is a good idea, in principal, but it only really works if the person being warned has an understanding of networks.

In this case, detecting unknown computers could just generate confusion, particularly on a small sized network (with no full-time computer tech), where one might not be aware (and not want to be aware) of all new computers appearing on the network.

In this case, the GM probably just wanted some virus/spyware protection, but ended up getting a lot more than he really wanted.

The “unknown computer on the network” feature is probably not appropriate in a product that gets sold to the general public… particularly when most people just stick the CD in the drive, install the software, and then want to get on with their work without having to worry about their internet security.

I really didn’t have time to see if I could turn off this feature, but next time I get a chance, I’ll probably disable it.

Posted in Technical | Tagged mcafee, unknown computer

How reliable are internal laptop WiFi cards?

Computer Aid Posted on 10 September, 2009 by Luigi Martin10 September, 2009

I’ve started noticing a interesting trend: the built-in WiFi in laptops seems to break quite often.

Whats worse, is the failure seems to be either intermittant, or causes hardware timeouts (otherwise seen as a “very slow laptop”).

Its difficult to diagnose a failure, when the WiFi might run OK for hours / days, and then stop working for hours/days… or if the laptop slows to a crawl for about 1 minute every hour.

I often end up going around in circles, until I decide to plug in a USB WiFi adapter… and then everything runs perfectly.

I once wondered why most laptop makers continue to build laptops with a removable WiFi cards (rather than integrate them into the motherboard). I thought it might be so they could offer a WiFi-less laptop for a lower price.

wifi-card

Now I’m starting to think it might be so that these unreliable components can be easily and cheaply replaced when a warranty claim is made.

Posted in Technical | Tagged 802.11, network failure, wifi

how to connect a monitor / ADSL modem, correctly

Computer Aid Posted on 7 September, 2009 by Luigi Martin7 September, 2009

I’ve seen this happen a few times:

Someone gets a new monitor / video card / ADSL modem, and they also get a confusing (ie more than 2) number of cables.

So, if you don’t know much about computers… what do you do?

Most people will just connect them all.

So I often see modems with both USB and ethernet cables plugged in.ethernet plugUSB printer plug

Or a monitor with both the VGA and DVI plugsdvivga plug connected.

But it isn’t needed, and under some circumstances, it can either cause strange problems, or make troubleshooting more difficult.

As far as ADSL modems are concerned, only use an ethernet connection. Avoid using USB (the plug with the “rounded” square end) unless your PC doesn’t have a working ethernet socket (looks like a wide phone socket).

You can also use the USB plug if you want  to connect more than 1 computer (usually 2) to the internet. Any more than 2 computers, and you should probably look at buying a router (which are quite inexpensive nowdays)

When it comes to video, its actually not critical to have both cables plugged in. But if you have the choice, go for the DVI (24+ pins), instead of the VGA (15 pins). But try them both and pick the one that seems to work best.

Posted in Technical, Tutorial | Tagged cable, dvi plug, ethernet port, USB port, vga plug

Fast video cards: watch your power supply.

Computer Aid Posted on 4 September, 2009 by Luigi Martin4 September, 2009

This PC had many problems. On the surface, it should have been quite reliable:

  • Core2duo E4300 (1.8 Ghz)
  • gigabyte 9800 GT
  • 4 X 1Gb DDR2 RAM
  • 2 X HDD

But it would often crash, generate BSODs, sometimes wouldn’t start, sometimes the bios would say “overclock failed” (it wasn’t overclocked)…

A few months prior, I had pinpointed a power supply issue (it was an old 500 Watt PSU, so I replaced it with an 860 Watt unit).

Well, after a lots of trial and error, I eventually unplugged most devices (ie only 1 stick of RAM, 1 HDD, 1 DVD drive… and then I noticed that the PC would fail when I started a graphics-intensive screen saver (Hyperspace from http://www.reallyslick.com).

The 2 month old PSU would make a high-pitched squeal for about 2 – 10 seconds, then the PC would “die”.

I was scratching my head thinking: the PSU must be powerful enough to handle the PC…

I plugged in a cheap video card, and the PC suddenly became rock-solid… no weird errors.

9800gtI researched the power consumption of the 9800GT card, and I see it uses anywhere between 150 and 250 Watt!

OK, its quite possible that the video card drains so much power, that some PSUs just can’t handle it.

I replaced the 860 Watt Power supply with a similar (but better quality) one, and everything ran well once again.

I returned the PC to the customer, with a warning of possible future problems: if this starts happening again, you will need to buy a much more expensive, 1000 Watt power supply.

So I re-learned something: a high-end video card will sometimes force you to buy a high-end power supply.

Posted in Technical | Tagged 9800 gt, power supply

PC Maintenance Tips To Help Prevent Computer Problems

Computer Aid Posted on 1 September, 2009 by DEI1 September, 2009

Wouldn’t it be great if your computer was programmed to perform preventive maintenance on its own? This would automatically prevent various computer problems and increase the efficiency and life of your PC. While many computer maintenance tools have become partially automatic, it still  takes your initiative to install and use these programs. Moreover, preventive maintenance not only involves deploying and using the right tools, but also adopting the correct computer practices by the user.

It is also a pity that computer manufacturers do not provide a manual or step-by-step guide for PC maintenance. They simply pre-install a few tools and assume that you will use them without bothering to know whether you know how to use them or not. This article provides basic PC maintenance tips that will help you prevent some of the most common computer problems.

  1. Keep your hard drive clean and uncluttered: This is one of the easiest tips to follow yet you may have ignored your hard drive for a while. If you find that your computer is slow and prone to errors, the starting point is to begin by cleaning your hard disk. You simply have to make frequent use of two tools that will quietly run in the background while you go about doing your work. These are:
    1. Disk Cleanup Utility: Main function of this tool is to eliminate unwanted files from your hard disk
    2. Disk Defragmenter Utility: Main function is to organize your files to make their access faster
  2. It is easy to ignore these two System tools provided by your operating system but if you make optimal use of these tools, you will be able to prevent a lot of computer problems.
  3. Perform regular Registry Cleanup: You may not be aware but an unhealthy Windows registry is one of the main reasons for computer issues and errors. The Windows registry is extensively used to store critical configuration information of your system including operating system, computer applications, and hardware as well as user settings. Since the registry deals with huge amounts of information, there are always chances of unwanted information being left behind that may lead to problems. To clean your registry, you can make use of any of the good registry cleaners available in the market. These tools not only provide registry cleaning service, but also provide registry defragmentation, registry backup and restore facilities.
  4. Protect your PC from external threats: Since the Internet became popular, your PC has become more vulnerable to threats from the outside, which includes malicious software like virus, spyware and online criminals trying to hack into your system. You need to install the following three tools to protect your PC from external threats:
    1. Anti-Virus: To prevent viruses, worms and Trojans from attacking.
    2. Anti-Spyware: To prevent Spyware and Adware from sabotaging your PC.
    3. Firewall: To prevent unauthorized people from gaining entry into your computer.

These days many anti-malware manufacturers offer a common software suite that carries all these products in one pack.

You must install tools of reliable brands only and always have them running in real time. You must also update them frequently so that they are equipped to protect you from the latest types of malware.

Posted in Technical

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