Constant BSOD

[Sparrow Dono]

Im running windows 7 home premium currently and i cant figure out my current problem.
When i run the computer for a set period of time it will crash followed by a blue screen of death stating "Bad Pool Header", i also recently got one saying "System Service Exception".
the bad pool header tells me to update my system drivers which i have (except the bios as i dont know how) and the graphics card doesnt seem to want to update refusing to run the driver installation. Any ideas how i can stop this problem?
I remember it first started when i was playing a game (dragon age if it helps), and it suddenly crashed while playing and wouldnt load after that and i had to reinstall windows to get it to work but now this problem has been happening ever since.

OEM
Windows 7 Home Premium
AMD duel core 64 bit Athlon II
Asus M4A79XTD EVO Motherboard
Asus EAH5770 CUcore 1GB GDDR5
6gig Patriot DDR3 Ra
all the hardware is nearing a years age and the windows installation is a few months old and i have reinstalled as stated above

 

[DeanP]

Hello, can you please enable Driver Verifier? It will help us find the faulty driver.
http://www.sevenforums.com/tutorials/101379-driver-verifier-enable-disable.html