Running xp pro. My pc shuts down suddenly when i'm on the internet or when i'm running any sort of scan, adaware, spy bot, etc... i also notice that i periodically see a very brief appearance of a program running on the task bar with a white square file symbal. It's some thing like what you would see on the task bar if you minimized a window-but it only lasts for about 1-2 seconds. I ran Spy Doctor and it found tracking infections and registry items but did not rate them as critical! Also, Spydoctor pay version was recomended to remove. But i can't afford it for now so, can anyone offer a free or very cost effective solution?