hi, I have read many of topics and other forums but still no luck. I want to built a pc. All the parts are brand new. SPECS: Gigabyte Z68X-UD5-B3 Graphics Cards ASUS ENGTX560 Ti DCII TOP/2DI/1GD5 Corsair Vengeance CMZ8GX3M2A1600C9 i5 2500 processor modxtream 600W coolermaster V8 lite one x24 Samsung Spinpoint F3 HD103SJ, 1TB When I install windows and the installation is finished, the pc reboots, and the BSOD appears with the error codes 0x0000007E (0xC0000005 ....etc) He keeps un rebooting and BSOD appears. 1. I can't boot with safe mode 2. I tried other windows install cd's (32bit and 64 windows 7) 3. I also installed on a HDD the windows on a other pc, then put the HDD in my pc and also the BSOD occures. 4. my bios is up to date 1.10 5. Windows can't be repaired by cd. 6. I tried to boot up by cd (linux) and yes, it works. Just to be clear: I can't boot windows or safe mode. It always restarts + every windows I install the same errors eccurs. (vista,windows 7 etc) So I think something is wrong with the RAM or Motherboard. Still i don't have a clue, because al the parts are NEW. HDD works, videocard works, processor works, I will test the memory tommorow, but I don't think there is the problem. Please help me.