Laggy issue while scanning for max core/mem

[C_A]

I'm having an odd problem. If I hit the 3d view, it appears to work normally except that the sliders are laggy if I try to move them. However, when I try to scan for the max core/mem, whenever it goes into the heat-up phase, it has this odd stutter where it the image will rotate for a fraction of a second and then "skip" ahead a bit and continue to repeat this pattern. If I abort, the 3d view will stutter less and less until after about 20 seconds, it's back to normal. While doing the scan, the sliders are even more laggy than usual.

This is a brand new setup, so it is possible that some piece of hardware could be bad. I'm using a DFI nF4 UT Lanparty Ultra-D and an ATI x800gt02 (16 pipes out of the box, unmodded in any way.) I just completed a very similar setup on a different PC and I did not experience this issue. All drivers are up to date and all windows updates are installed. The only real difference between this PC and the other is that I'm using XP Pro on this one and XP home on the other.

Thanks a lot for any help you can provide.