I am fixing my uncle's computer right now. It is a 4 year old Compaq and it has anti-virus software on it. The problem is, the anti-virus definitions have never been updated in the 4 years he has owned it.

I downloaded a free tool called stinger.exe, which is a utility used to detect and remove the most common viruses out there. To make a long story short, I stopped it after it had found 800 seperate instances of viruses and I have blown the hard drive out and reloaded the OS.

Here is a link to Stinger.exe if you would like to try it:
http://download.nai.com/products/mcafee-avert/stinger.exe

Just save it to your desktop and double click the icon. You will know really quick if you have a virus problem.

Cheers!
Bill