Start in SAFE mode (press F8 wile booting) and choose SAFE mode from the menu to see if it works in Windows DEFAULT setting. Then reboot and reset to 32Bit, and 78Hz max.
My guess is that MSoft pushed a patch or SP to your box and IT replaced the dll your monitor was using.
Good Luck!
Let me know if this fixes it
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Change the video card refresh rate to 60 khz.for the vertical and the horrizonal. This software comes with the video card so I cannot tel you how to access it.
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