I also have problems with pop ups after downloading Grokster. To make it worse, they are porno pop up ads. I have popup blocker which blocks them, but if I need to turn popup blocker off to access legitimate sites, then the porno ads beginning popping up immediately. Anyone discovered a way to make them stop for good. I removed Grokster several months ago but the problem persists. Thanks for any help.

Download and run AdAware and Spybot Search & Destroy.

To add to Dougs reply, also try Spy Sweeper, it works great for me Also try Ads Gone pop up killer, stops ton and tons of popups and does not close legitimate sites, it's a very very accurate pop up sopper Zero Cool

A firewall like ZONE ALARM PRO has excellent settings called AD BLOCKING, MOBILE CODE CONTROL and COOKIE MANAGEMENT that works very well and can be disabled easily, ON and OFF quickly.

Becky, Just curious... did you clean your registy of Grokster? If not there may be a trace of it making the pop-ups return.