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Well tried all the suggestions, so thanks for all the advice Guys, but nothing will make it work, its one of those Microcrap things, whatever you do and you can spend half your life on it, forget it wont work!
So thats it- Finito Movie Maker!
Guess only thing left to do is get the free upgrade to Win 10 which I had considered doing anyway, that may bring it back...but who knows with Micrcrap, you just never can tell what it will do and what nasty surprises lie in store.