New build freezes on motherboard logo or windows loading bar

[akousticgroove]

I recently build a new system and it keeps hanging at the motherboard logo as soon as I turn it on. When I do manage to get into Bios and make some kind of change sometimes it will boot to windows normally and just when I think the problem is gone it goes back to the same problem. Sometimes when it does pass the motherboard logo it will freeze in the Windows loading bar screen. It has never frozen when I'm in Windows. So it makes me think it's either a video card problem since the 8800's are buggy, a bios problem, or memory or finally a Windows Vista. Can someone please help me? I've never overclocked the system, The only thing ive done is to update the bios to the most recent one, updated the Video card driver and change the ram to a different slot. No luck yet. Now remember I was having the same problem before I updated anything.

These are the specs for my System;

CPU: C2D E6400 2.1ghz
CPU Fan/Zalman: CNPS9500
Motherboard: P5B Deluxe
Ram: 2g of GSkill DDR2-800
Sound Card: Creative Sound Blaster X-Fi
Video Card: Foxconn GeForce 8800GTS 640MB
Power Supply: HIPER 580W
Hard Drives: 1 10k 150G WD Raptor, 2 7200 WD 250G
Optical Drives: 1 Sony CD-RW, 1 Sony DVD-RW
Operating System: Windows Vista Ultimate

 

[akhilles]

When it goes past POST (see mobo manual for its meaning), run this for 5+ passes:

http://www.memtest.org/#downiso