Something's wrong with my computer. It started to happen 2 days ago. Whenever i open a 3D game, (E.g TES4 - Oblivion, Mirror's Edge, L4D) my computer locks up after a few minutes. I've checked everything. Fan on GPU is spinning, temperatures are running ok. Even after formatting my computer, lock up still occurs. Running the latest beta drivers for Windows 7. I'm pretty sure it isn't the operating system that's giving me problems. Cause i had windows 7 on for a long time, been playing many games. Works perfectly fine until 2 days ago It's a hardware lock up i'm pretty sure because i can't alt+tab at all. Even though my logitech G15 lcd is still cycling through the different menus, when i change it, it too hangs. Even after a fresh format, it still locks up. Hardware as follow on my System Specs. Any idea's? (Update: Screen goes black for background music continues to play. Also when i hit alt+tab, everything hangs) (Update: Ram's are ok after a memtest86+ bench) (Update: My Game Oblivion started to crash in a minute after a change in Option "Texture Size: High".) (Update: GPU Ram test shows no error.) (Update: Seems like even in windows XP, i'm getting random lock ups even in MMORPG games.