Customer has a few problems at his business.

One PC just won’t start properly, gives a shimmering, multi-colour display, and sometimes just won’t start.

Another starts, but 2 minutes after starting, windows XP shuts down.

And the network shared drive sometimes only work in one direction (PC A can see files on PC B, but not vice versa).

After some investigation, it looks like norton Internet Security is selectively blocking drive sharing information.

I’m about to fix the norton blockage, but since the customer has 2 PCs with expired norton AV, and a PC that is close to renewal, he is happy to try something different.

So I give him some choice. On one PC, I install AVG Anti-malware (30 day free trial), and on the other 2 PC’s I install antiVir, and windows defender.

I install winpatrol, and spywareblaster on all PCs

Diagnosing network problems can be difficult enough, without legitimate software throwing a spanner in the works.