New Build Keeps Freezing

Help!!

Last Thursday I upgraded my mobo and cpu (MSI K7N2 Delta 2 Platinum & AMD XP 3200+) to a MSI K8N Neo2 Platinum and AMD Athlon 64 3500 Venice. Windows installed with no problems, but every so often the PC will just hang, the mouse won't move, the keyboard does nothing so I have to press the reset button on the case. I've installed all the latest nForce drivers for both the Mobo and Graphics card, Ive installed all windows updates anmd downloaded and installed tha AMD drivers for XP.

Also what timings and voltage should I be running my memory at, its Corsair TwinX2048-C2PT and I've currently got it running at 2.5-3-3-6 @ 2.75v, the corsair website says to run at this.

My Machine spec is:
AMD Athlon 64 3500 Venice
MSI K8N Neo 2 Platinum
Corsair TwinX2038-C2PT
XFX 6600GT 256MB AGP
2 x 160GB Maxtor DiamondMax 10 SATA (Striped)
Sony DVD-RW
Hiper Type-R 480w

Thanks in advance for any advice anyone can give.

Cheers

Just thought I'd add a bit more info on this.

I've just tried to run Office Updates, it found a few updates, downloaded them, but it got about 10% through installing when it froze again.

Is there any chance this could be the northbridge overheating? I say this because I hvae replaced the stock fan with a Zalman heatsink to cut done on noise, the only problem was that when I put the Graphics card in the Zalman was too close (very nearly touching less than a mm away) to some components on the graphics card so I moved it very slightly, could it be that by moving this the northbridge is not being covered completely and part of it is overheating causing the crash?? I have no idea, just an idea really.

I could really do with any help, advice, and suggestions as this is getting frustrating, I haven't been able to play any games in about 2 weeks now!!!

I had a problem like this that was casused my my Bios been out of date, and not compatable with my Drivers, and update and formatt solved this.

I would try Reisntalling ALL your drivers, or take them off and then see if it still crashes. It sounds more like a software issue than a hardware one.

Does it happen more under load?

Yeah, I've just updated my BIOS, it was 1.5, now got 1.B and that seems to have solved the problem. All I gotta do now is figure out how to sort my internet. Thanks for your input Tripledance.

try downloading and running Memtest.

It can run from a Floppy or a CD rom...just boot with it as primary boot drive and let it run the tests.