On this Dell Dimension running Windows XP Home a small window randomly pops up saying "The web page you requested is not available offline" and gives me options of connect or stay offline. The "Work Offline" is not checked under File in IE. This occurs while not connected to the internet (obviously, I guess). This PC had virus/spyware/adware problems, but after running Spybot, Ad-Aware, Avast, AVG, Ewido, etc. it seems to be clean now. But...it looks like something's still trying to "phone home", and that worries me. The owner said all the problems started shortly after that window started showing up, and then slowly got worse.
I cannot find what's trying to connect to the internet. Help, please!