I have been watching these forums for a while. I have seen other people with similar problems. My computer will just freeze up usually with a screeching sound loop if sound is playing. Mostly when playing a game like quake 3 or watching a DVD. Sometimes while screensaver is on sometimes when just surfing. I have assumed that it is my radeon. I have tried to install the new driver from ATI but I get a message like "could not locate required INF file" or something like that when installing. I have downloaded it more than once and installed multiple times. Had to revert back every time because once windows starts I get no signal to monitor.