I've a Asus M4N72-E Motherboard, a AMD Phenom II x4 64Bits, Windows 7 64Bits installed.. WaterCooling system with .02 Liquid Nitrogen Solution from Thermaltake with it, Processor is New Memory is New Motherboard is new Hard Drives are new 2 VelociRaptors 200 GB. 4 GB Ram OZ Series with heat Sink. 2x Nvidia 280 EVGA Black Pearl (New) Power Supply is new OZ Xtreme 800W with dual line for Video Cards. The System Board is running at 37 Degrees The Video Cards are running at 32 Degrees Processor is running a 41 Degrees Motherboard has the 750a chipset, The system Bios is 802 (latest from 4/9/2009) The system is running perfectly on Vista and no problems at all . I decided last night to install Windows 7 . Installed all drivers, and installed everything, I had to install from the Nvidia Page the Nforce Drivers due some non detected nvidia parts.. the system maximun temperature is an averange of 47 degree . When playing game. The maximun for the motherboard to automatically shutdown is 71 Degrees.. that is the processor max temperature. told that the system is not overheating. Memory are tested on other system, on vista and work perfectly no problem (similar system with vista) Same system with the difference of only 1 hard drive instead of 2. After certain point while playing game the system suddenly shutdowns... like i took out the power supply. I am thinking on going back to vista, since the problem is pretty anoying. And some times, i have to restart the computer 3/4 times in order to get it back to work. Some times when loading. The system automatically shutdowns Mostly happens when I am playing games that has to use Direct3D (Wow, SWG, Age of Connan) I am assuming is a proglem with the operating system.. since the same machine ran Vista W/O any kind of problem for an entire week. Any Sugestions?