Aopk, I didn't mean changing your home page in the reg will casue problemes, but simply the fact that after some negitive expiriances, i have learned that it isn't good to teach someone to use the register of there pc, even thought it works out fine 99.99% of the time, there is allways that 0.01% that goes know, and I prefer to not take that responsabilty
you said it came up in a popup, maybe it is spyware deliberately sending you popups, but are made to show a blank page just to annoy you. try what marshall said and run spybot
Please download Adaware from the link below first http://www.lavasoftusa.com/software/adaware/. Then open it and check for updates. Tehn run a scan and when complete remove all it finds.
Then download Hijack this http://mjc1.com/mirror/hjt/ , unzip it and do a scan. Then save the generated log file as well as copy and paste it here for review.