Im going through the same thing right now, I just built a gaming system used a Radeon HD 6970 AMD 6100 Six Core Asus Motherboard Crucial 16GB, I don't think it is the build, I confirmed each component was a listed compatible. Windows 7 is stable and I burned in for 5 days before installing steam. Updated the Bios, and installed the factory drivers and updated them as well. I am now beginning to disassemble the system driver by driver and piece by piece, if anyone has a clue on why steam games blue screen once the obvious things are done, please chime in. Cause this IS heartbreaking.