Windows movie maker all of sudden cannot open and says effect file is corrupt

Hi, I've been using Windows Movie maker(i think it is  2011) for years now and all of a sudden I cannot open it on my computer.  I go to start menu, click on Movie Maker(like I always do and have always done) and it says:

One or more of the effects files that Movie Maker needs

in order to run is corrupted.  Please repair Movie Maker by clicking

"Uninstall a program" in Control Panel, and then double-clicking "Windows Live Essentials".

The problem with this is that I want to keep Movie Make 2011.  I have followed the instruction and it gave me Movie Maker 2012 and now I can't use any video I"ve already recorded b/c they are .mov and I already have a project in progress.  I don't want to upgrade to Movie Maker 2012  b/c I don't want to have to convert my video files everytime I video.  I have restored my laptop back to a previous restore point before I downloaded Movie Maker 2012 so now I'm back to the original message that the effect file is corrupt. 

Please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!