New pc with issues

[Cronambs]

I've recently built a new pc and been comming across an issue where randomly the whole computer crashes and not able to get into task manigure (crtl, alt, del), this has happend many times to me with windows xp 64 edition and windows 7 but have not seen it crashed through linux so i was thinking if its a over heating issue or memory issue so any idea's

my opinion is that i dont really think its over heating becouse the pc dont seem to be getting hot and theres enough fans to keep it cool so right now i dont know

for pc specs i will post later but i can say the operating systems i have is Windows xp 64 edition, Windows 7 beta, and Ubuntu 8.10 32 bit

[BassAce]

bump

[Cronambs]

bump

no need to bump but thanks, I've done upgrade with bios and seem to crash rarely and my brother has same pc so it could be memory issue. but because no one knows what could be problem means I'm on own for this one

[my44mag]

for sure can be memory? changed the rams out on my sisters 2 Dells and it seemed to fix it.