Add/Update these DWORD values in the registry:
Note that computers, which are using ACPI and not having a "Plug and Play BIOS" in the "Device Manager" under "System Devices", should not use these settings.
[HKEY_LOCAL_MACHINE \System \CurrentControlSet \Services \VxD \BIOS]
CPUPriority = 1 (0=Realtime, 1=Foreground Max, 2=Foreground Med, 3=Equal) (Default=3)
FastDRAM = 1
PCIconcur = 1
AGPconcur = 1 (For those with AGP display adapter)