I share this PC with three teenage boys so no telling what the heck they may have downloaded. I have never disabled my virus protection to play the game and I can't think of any other recent changes except that my Dell smart keys don't work upon boot up either. I need to reset them every time. I figure I can save my saves file and delete and reload the game if necessary. I just thought maybe this was a common problem that others had dealt with before. Thanks for your response Raze.