I downloaded a video "codec" that turned out to be this ugly trojan, worm, THING. Basically, "Antivirus XP 2008" keeps popping up. My background was hijacked, but I've fixed that. I only have Avast home edition, and its not doing a good job of scanning, although, I've been able to move a couple infections to the chest.

I have no idea how to get a log for my computer, so I need help. And lots of it.