New processor = crashing

Hey.

I recently bought and installed a AMD athlon 64 X2 6000+ AM2 processor and also flahsed BIOS because my motherboard didnt recognize the processor. Now im getting bluescreen about " IRQL_NOT_ LESS_THAN_EQUAL" constatly after computer has been running for a while. So im guessing something to do with motherboard and processor not liking each other?

Would it be just best to got to the local store and buy a new motherboard straight away?

PS: Writing this as quickly as possible before it crashes again.

System:
AMD Atholn 64 X2 6000+ AM2
Ati radeon 4850
3gb 800mhz DDR2
Abit KN9 ULTRA
Vista Business 32bit

Please don't double post. See this post here, it is the same.

~Lordbob