If you are running an AMD processor with PowerNow technology, go to power options in the Control Panel and set power scheme to "Always On". That will shut off the cpu throttling. If you are running an Intel chip with SpeedStep, you may have to look in the BIOS for "EIST" (Enhanced Intel SpeedStep Technology) and set that to disabled. Please note that the power scheme change for the AMD processor only works under Windows XP (As far as I know) but the Intel Speed Step fix will work under XP and Vista as it's a BIOS-level change and is independent of the operating system.