Audio plays fine, but video is now corrupt... green, distorted video window

I have various quicktime files on the pc that played fine but are now unable to be viewed. I have downloaded again, they play fine... but now a few days later... audio, but no video at all... not "scrambled", just video "noise", really.
I have reinstalled quicktime.
Any ideas??

+I have various quicktime files on the pc that played fine but are now unable to be viewed. I have downloaded again, they play fine... but now a few days later... audio, but no video at all... not "scrambled", just video "noise", really.+
"Green" gets me thinking about issues with DirectX on the PC.
Have you tried the "Disable Direct3D acceleration in QuickTime" section from the following document? (iTunes uses QuickTime for video playback, so the same basic troubleshooting procedures apply.)
Troubleshooting iTunes for Windows XP and 2000 video playback performance issues

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