When I burn a DVD with ImgTool (and probably directly with Nero, though I haven't tested) my system clock slows down, to the point where it is anywhere from 1 to 4 minutes slow by the end of the burn. I should say 0 to 4 minutes, because sometimes it doesn't slow down at all.

My system:

NEC ND-1100A (haven't flashed BIOS)
Athlon XP 1600+
MSI K7T Turbo2
1G PC133 SDRAM
Windows XP Pro
All drives DMA

Any idea why this would be happening, or what it would take to fix it? I've already been late for an appointment because my computer's clock was 10 minutes slow.

thanks,
-Laurence