[Revolting cat!]

Run Spybot as well. I had a nearly disastrous Trojan, spyware, hijacking infection last week that took me 3 1/2 days and countless reboots to combat and conquer using 2 spyware removal programs and three anti-virus products, the best of which finally cleaned it up and started acting like a virus afterwards grabbing 99% of the CPU cycles, so I had to remove it. Ad-aware alone and AVG which I had started out with and which should have protected me just wouldn't do it. And guess what? I didn't download anything for about a week prior to the infection, didn't open any e-mail attachments and didn't visit any porno sites.

[TonyInOhio]

I suspect your cat:

[Jeff Gordon]

I didn't download anything ...

Did you, by chance, view some internet video using Windows Media Player? If you don't have a firewall you could get infected and not know it.