Question : All programs open Windows Media and not what I called up

When I try to open any programs  Windows Media Player opens saying I can not play this item due to a codec.

I can not even open system restore or m web cam so I need to help getting my computer back to the way it was.

Thanks

Answer : All programs open Windows Media and not what I called up

The .exe association fix from the following page should fix the problem.

File association fixes for Windows Vista:
http://www.winhelponline.com/articles/105/1/File-association-fixes-for-Windows-Vista.html