Hi everyone. I suspect this will be my last post on this thread. Well, it turned out to be a file called "mfin32.exe" which embedded itself into the registry. It looked like official Microsoft stuff, so I ignored it the first few times around. Then when I hooked up to the internet tonight, this program took up over 98% of the system resources, and the popups poured in so fast it crashed IE. Basically, I went back to the registry, deleted it, and at the folder source too- as you guys suggested. Result? Popups completely eliminated. Thanks guys!