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Nero Vision Xtra won't display video in review and burning screens.

I've used Nero for about 7 years.
I use Nero Vision 10; but now it will not display video on the Review screen (I hear the audio though), nor on the screen when burning a project. Awhile back, I installed VLC ( a player) Since then I uninstalled VLC. How does one link up a video player to the software?
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