Hey all. Lately, my computer has been freezing and blue screening. This mostly happens when I'm playing games, but sometimes the comp will be locked up at the desktop when I've been away from it for a while. They're very random in nature. All of the blue screens have involved a memory address, not a graphics driver for example (graphics driver is up-to-date). So I ran memtest86 for 14 hours, not one error. My system is over there with Windows 7 64-bit, nothing is overclocked. Avast has turned up no viruses, system is defragged, adaware is ran frequently, I'm using zonealarm free firewall. Hard-drive error checker returned nothing. I have also been routinely checking temps, nothing is overheating. One tmpin in cpu-z hardware monitor reads 81C but it always reads that. I'm very stumped here, folks. Any ideas?