Help! PC won't boot

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I recently bought a Intel Q6600, MSI P35 NEO2, and 4GB 1066 Corsair Dominator RAM.

Had it at 3.0ghz (9x333) default everything, and it seemed to run 'OK'. Was playing Gears of Wars and it bluescreened on me so I figured something was wrong. But now the thing won't boot.

It was posting and then just hanging afterwards, but now it gets stuck at post.

I have tried resetting the CMOS but this isn't working. I managed to get into the BIOS once but as I was changing the system clock, it froze (?!?!). This hasn't ever happened to me before so I'm pretty confused, any ideas?

Thanks

ste

Windows VISTA 32-bit
MSI P35 Neo2
Intel Q6600 2.4ghz SLACR (stock cooler, ran at 46C idle)
4GB 1066 Corsair Dominator RAM
2x ATI Radeon 1950 PRO (Crossfire)
Creative X-Fi Fatal1ty
Antec PSU 1000W

If you need to know anything else let me know!

** EDIT: I just tried resetting the CMOS again and it posted and booted off a disc, it doesn't want to boot from the HDD so I'm installing Vista 64-bit onto it. I have absolutely no idea what happened but the bluescreen has apparently nuked my Windows install, nice

H3X4D3C1M4L

That can happen. I would suggest running a memory test to see if it happens again, possibly a hard drive diagnostic.... and reseating the RAM and other things firmly can't hurt either