Bluescreen problem.

Hey guys.
Need help!! My pc keep getting bluescreens all the time. Anyone have an idea what could be the problem?
Specs:
Amd Phenom II x4 955 3.2GHz
Asus RADEON HD6950 OC
Gigabyte Ga-990FXA-UD3
Corsair Vengeance 8 GB 1600MHz
Corsair TX 950W
Need help!! My pc keep getting bluescreens all the time. Anyone have an idea what could be the problem?
Specs:
Amd Phenom II x4 955 3.2GHz
Asus RADEON HD6950 OC
Gigabyte Ga-990FXA-UD3
Corsair Vengeance 8 GB 1600MHz
Corsair TX 950W