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Underclocking an X1650 Pro in Vista 64?

I have a Radeon X1650 Pro, and it just doesn't work - the display driver crashes trying to play any game newer than the original Unreal Tournament. I'm using the latest Catalyst drivers (7.3) but no luck. I'm trying to see if it's actually a heat issue, which I could figure out by drastically underclocking the card. However, I have no idea how to underclock something in Vista x64. Since it requires signed drivers, I can't install ATITool or the like. Any ideas?

My Computer

if its only the drivers are unsigned then run this command then reboot.
then install the drivers, will allow 64 to boot with unsigned drivers

Bcdedit.exe /set TESTSIGNING ON

Bcdedit.exe /set TESTSIGNING OFF

My Computer

System One

  • CPU
    PHENOM II X4 Quad Core 965 Black Edition CPU, 3.40 GHz
    G.Skill 4GB (2x XMS3 2GB) PC-12800 (1600MHz
    Graphics Card(s)
    nvidia 9500 gt
    Sound Card
    on board
    Monitor(s) Displays
    T231H / X243H ACER
    Screen Resolution
    Hard Drives
    Hitachi 500 samsung 1terabyte wd 750
    550 watt
    cooler master
    Internet Speed
    8000 dl 356 ul
    Other Info
    booting xp32 2x dual pci-e digital tv tuners
    xp pro v 1xpci digital tv tuners
    vista ultimate 64 1x pci sat tuner
    win7 64
    win8 64

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