bsod on startup :( Options

[=R6= Raile]

yo guys

so last night my computer decided to bsod on me while it was just sitting at the desktop. Since then, it bsod'd about 5 seconds after loading the desktop each time I booted it. The first time I tried to boot in safe mode, it worked, however, the second time I booted it up, now safe mode won't work either (it gets to a black screen, with a mouse cursor, but just hangs there. even when booting in to safe mode with dos prompt only). So I'm kind of fucked. I've tried removing each ram stick and seeing if any of those are causing the problem. I've tried using the windows boot up disk (i'm using vista btw) to repair windows, do a system restore, and check for memory problems. basically I did every test the windows disk has to offer, and nothing worked. I'm guessing it's gotta be hardware? Though I didn't think it mattered, I pulled out my audio board anyway and tried booting but no change. It's the only thing I think I can unplug and test. All I've got left is the mb, graphics card, and harddrive. Any suggestions on how I find out what the problem is?

Cheers

[=R6= Raile]

i did select it and i'm 99% sure it said c:

i'll go double check just to be sure


and yeah its the same cd which installed it

edit - confirmed, it comes up as c: when searching for windows partitions and asks me to select the one with the os (i only have one HD and it's my c:)
i also tried changing directory in to drives a thru g just to see what would happen. it doesn't let me change out of X: