I got a laptop that was infected with newdotnet and webhancer.

I needed to take it back to the office, in order to properly update AVGAS (customer was using a slow telstra wireless card)

Ok, remove using AVGAS, do a disk defrag, remove temp files.

Then I decide to do a MS update, but at some point, I get “files required to use microsoft update are no longer registered or installed on your computer”. I then get a choice to repair… but then the update does some work, then loops back to the error message again…

After the 3rd loop, I find a nice solution at: http://www.petri.co.il/forums/showthread.php?t=4502

is summary:

Start -> run -> cmd

regsvr32 wuapi.dll
regsvr32 wups.dll
regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 atl.dll
regsvr32 msxml3.dll

after typing those commands, everything worked perfectly