Is my memory bad?

I have been getting every once in a while random hangs while playing video games such as Counterstrike and Motor City Online, and sometimes I get a bluescreen with what appears to be a memory error stating "Page fault in an unpaged area" which I am totally unfamiliar with. Does this mean one of my memory sticks is bad? Is there a way to check? Or could it mean my CPU/GPU is overheating (CPU sometimes reaches 52...) I should hope my memory hasn't gone bad after only 3-4 months but how would I test to be sure? I constantly run SETI@Home and it never really complains.

i didn't and still dont think memery goes bad, it is a heat problem