I started a new thread because I feel that the nature of the matter has changed.
I hope it is ok.
I posted the question in this thread : WLE 2012 and Movie Maker
To summarize :
I installed Windows Live Essentials 2012 and found out that Movie Maker would not open.
Here is the new development :
Some time ago I had installed WLE 2012 in my guest OS Win 8 PR, and I forgot about it. ( I don't use Win 8 PR regularly. )
To day I opened Win 8 PR and found out that Movie Maker version 2012 was working ok in Win 8 PR.
So, why no go in host OS Win 7 ?