Please help troubleshooting

I just put together my third build, and I'm having the strangest problem. After a few hours, aspects of Windows randomly freeze.

The keyboard still responds to Ctrl/Alt/Del and the Windows start button, but that's it. No other buttons respond. And the mouse cursor still moves as directed, but I can't click anything. This sounds like a software problem on the surface. The problem is 1) I've used this same copy of WinXP Pro to reformat numerous times on my last build, and it never did this. 2) Before freezing, the computer slows down first, like it's in a really intensive process.

I've narrowed it down to either the mobo drivers, or a defective part (mobo, ram, or processor). I'm not sure where to go from here though. Have any of you had this problem? And is there a better place to get new drivers than here?

Thanks


MB: GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX
CPU: Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core
Video Card: MSI N9800GT 512OC GeForce 9800 GT 512MB 256-bit GDDR3
Memory: G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
PSU: PC Power & Cooling S61EPS 610W Continuous @ 40°C EPS12V
HD: Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA
OS: Windows XP Pro SP 2

 

Go to Control Panel/Admin Tools/Event Viewer/Windows Logs and see what is reported there. There should be a report of what is causing your problem.