I have installed vista premium. It was working until yesterday. My monitor frequently displays no signal input. I then get a screen saying various faults ie 0xc0000428 or 0xc0000001 or 0xc0000221 or winload exe missing or corrupt as I have tried to boot. I have run the memory test, there is a hardware fault but I am unsure how to cure this. I have xp on another sata drive though in ide mode. Vista is on an ide drive. I have 2gb pc3200 ram, radeon 9550 graphics card. Please advise!