Drivers are updated, but PC keeps freezing

Hello, First of all thanks to anyone who can help.

Here is my problem: I just built my brother his computer for Xmas and everything is brand new and the computer is "working". Yet every time I start a game or try to get the system rating the comp either freezes, restarts, or blue screens. I've updated the video card half a dozen times and It says that it is updated yet problems still occur.

Here are the specs

OS- Windows 7 64bit
Video card- AMD Radeon HD 6900
Processor- AMD 6 core 6100
Motherboard- 990FX Sabertooth
Ram- 8gs
Power- antec 900w
HD- 2 terabyte
 
Although that processor is supported by the motherboard, it's possible that the BIOS is an older version, pre-FX.
 
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