I’m frustrated

No video preview in nero vision 10

I have Win8.1 with all the latest updates. All shockwave video updates too.
I've been using Nero Vision 10 for a few years and its been trouble free until now. 19 March 2015. When I import a video file there is no preview to see, only audio.
(I have uninstalled/re-installed Nero Media Suite and still the annoying error occurs)
Thanks from Simon
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