My uncle brought his computer that I built for him to me saying he was having trouble with random freezing. Sometimes it would freeze after an hour, other times it would freeze after a few minutes. I had him clean both inside and out with a can of air and the thing looks immaculate. It still froze, so dust wasn't an issue. I checked all of his temperatures and voltages and they're all stable and within an acceptable temperature range. Everything else I've tried seems to have done nothing. - Seagate Seatools found no errors - Chkdsk found no errors - Spybot found a registry change, but it was deleted and has found no errors since - Both a quick and thorough scan with Malwarebytes found nothing - Temp files and the like were cleaned with both Ccleaner and Kcleaner - The only thing Super Anti Spyware found was a few tracking cookies - Memtest found no errors in the RAM - Onboard video/chipset drivers were all updated - Several boot time scans with avast all show nothing - Hijack This found nothing suspicious - And I've done everything in this post verbatim. wwx.techspot.com/vb/post716873-6.html His hard drive contains roughly 80% free space. It doesn't matter which program you have open, eventually it will freeze with having control of the mouse, till you try to close it or pull up the task manager to kill it in which everything freezes and the motherboard speaker beeps continuously at you, forcing you to hit the reset button. I've exhausted everything I can think of to figure out the problem, so any new insight into this would be greatly appreciated. Thank you.