Go get spybot and update and do a full scan.

Then get Ad-Aware, update, and do a full scan.

Then go scan with Trend Micro Housecall.

I strongly suspect, as pointed out by Ernie, that the problem is on your computer.

If you're on any kind of broadband connection (DSL or Cable or whatever) and don't have one already, I also strongly suggest both hardware and software firewalls. Any 'broadband router' from companies like Linksys, Netgear or D-Link will work for the hardware firewall part. I like Kerio for software firewall, but there are others out there.

If any/all of this comes across as talking down to you, I apologize, but hope that you can understand the urgency of the situation.