I recently installed the Heroes of Might and Magic 5 MP beta that was on FilePlanet. Little did I know that it came with StarForce. Some other game that I installed before also seems to have been using it as a protection scheme. Either way, a while back I noticed that things were getting choppy, and things were jittering. I uninstalled the crap that StarForce installs, and voila, everything is good again. I suggest that you guys check to see if it is installed, and remove it if it is.