Pop-ups?

[Dragongirl]

..... if you "run" "msconfig" and go through the files that boot up with your computer, you can probably find the culprit.

If you want to check the boot programs in msconfig you can look here to find out what each one does :
http://www.lafn.org/webconnect/mentor/startup/PENINDEX.HTM

That site lists all kinds of programs that can be running on your machine. For instance it talks about your internat, one is benign and one is a virus depending on where it is located. Try the site.