Vista and BLUE SCREEN

> I bought Vistax64 Ultimate Edition almost a year ago. At first it was fine
> but at some point (i don't remember when this happened) i've started to get
> constant blue screens. For a while i had both Vista and Xp installed on my
> computer. While on XP i never had blue screens, doing the same thing on Vista
> did get me this. The blue screens seem to be randomly (rarely when the
> computer is on stand, most common when i play games with high settings). The
> blue screen codes vary and i think this isn't a good thing in discovering the
> problem. I've reinstalled the OS many times and still the same thing.
> Meanwhile i've changed many hardware parts and still i get blue screens (i
> always reinstall the OS if i change mainboards, sound cards or video cards).
> For a few months i only have Vista installed so there is no question of a
> conflict with XP. Atm i have AMD 6000+, mainboard Asus AM2N SLI, 2x8800 GT512
> OC (BFG manufacturer), a SB AUDIGY SE soundcard, 4gigs of RAM (Corsair at 800
> Mhz). I've searched on the internet the blue screen codes but no results and
> all the ppl i've asked to help didn't know what to do. So the only place i
> think i can get some help is here. Here are 2 codes i get:
> 0x000000C5 (0x0000000000000002, 0x0000000000000001, 0xFFFFF80001D3DD83)
> 0x00000101 (0x0000000000000061, 0xFFFFF98000A34180, 0x0000000000000001).
> The last 3 blue screens i had came with this second code. So if anyone
> thinks he knows the source of theese problems reply your solution. Thanks
> --
> crissy