I discovered that I had GrokLoader on my PC. Spybot seemed to remove it, but the next time I ran Spybot, GrokLoader still appeared to be there. Tony Finnegan
GrokLoader is most commonly installed with the Grokster filesharing program, so it's unwelcome but not particularly dangerous. Spybot Search & Destroy (http://safer-networking.org/) should be able to remove it, but you might need to run it from Safe Mode.
If that doesn't work, then either AVG Anti-Spyware (formerly Ewido) or Microsoft's Defender should fix it. Check the results by using Panda's ActiveScan or Trend's Housecall online.
When adware is installed by a "free" program, this can stop working when you remove the advertising component. Also, Grokster can install other adware programs, so removing GrokLoader doesn't guarantee your PC is clean.