Here is my problem: Sometimes my programs will just freeze up for anywhere between 15 seconds and a couple minutes. It usually happens to Firefox or games I am playing, and once it starts, a restart is the only thing that will stop it, and sometimes that doesn't even work. While frozen, the bar at the top of the program will read (Not Responding), and if you click the window while it is happening, the window will fade white until it starts working again. Sometimes only certain programs will be affected, for instance today when it happened, Firefox was freezing, but Windows Media Player was still running fine The trigger seems to be when I download something, but that doesn't always cause it. It just happened when I was watching a video online. It has been happening for a couple months infrequently, but just today got so bad it made my computer practically unusable for a few hours. I am running Windows 7 Ultimate 64-bit.