BSOD AMD Radeon HD 6850

Help! Keep getting BSOD.

Specs:
5 PC Vision AMD Supreme PII-1090T
PC-System 6.895,00 6.895,00
MBAM3 Gigabyte GA-870A-UD3
AMD Phenom II X6 1090T 3,2 Ghz AM3
CPUK AMD Arctic Alpine 64GT AM2/AM3
DDR3-1600 Kingston 2GB HyperX RAM 4,00
HDS 1000GB Seagate SATAII 7200rpm HDD
Radeon HD6850 1GB DDR5 PCI-E
CASE Vision Phantom Silent edition
PSU Inter-Tech 700W
Drev Samsung BluRay Combo Black
FRONT Vision Multifront B

I've reasonably installed windows 7 - 64 bit (had 32-bit) on my computer.. Everything went great, installed everything, used AMD auto driver installation and windows update, i didn't have any issues untill yesterday(Worked perfectly for 4-5 days).

Now i keep getting BSOD at the beginning of windows, and i have no clue what to do. Tried running it in safe mode, did not work either.
It all happened playing Starcraft II, having HDMI cable and digital cable connected to a LCD screen and monitor.
I havn't overclocked anything, though i did install AMD overclocking software, but did not activate it.
I remember it installer AMD catalyst control center 12.10 ver.

Anyone who's experience something similar, or perhaps could help me, would be great..

Regards Andreas