Windows 7 Ult on new build

I have just built a new computer -

Asus Sabertooth P67 B3
Intel i7 2600K (2nd Gen)
Seagate Barracuda 1TB 32mb cache
ATI Radeon HD 6870
Corsair 16gb DDR3 1600mHz
Thermaltake TR2 RX 650w
LG BDrom/DVDwriter

This is my first build. I have upgraded Mobo bios to 3209. I get the BSOD when I try to load Windows 7 Ultimate 64bit. [0x0000007E] Can anyone help? I know I have probably missed something. I did scan though the previous posts breifly to see if someone had the same prob.

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