Problem on mams laptop

Bet some of you have noticed, i’ve posted stuff about this like 100 times? always seem to break it gonna take it of her soon, Anyways..
EVERYTHING opens with Windows Media Center, : ie,firefox,folders, Everything.. any idea what to do? i’ve even tried going into the directory where they are installed, so i go into the folder to click on Firefox.exe but it still opens with Windows Media Center, any idea how i change all of this without formating? i can’t restore it either.
Answer #1
Thats really odd for a computer to do that allthough I had that same problem once but I didnt fix it, so sorry I cant really help ya.
Answer #2
If your using XP try here http://support.microsoft.com/default.aspx?scid=kb;en-us;307859 Or for Vista and 7 try this tool http://www.winhelponline.com/articles/231/1/An-Utility-to-Unassociate-File-Types-in-Windows-7-and-Vista.html
Answer #3
have you tired to put all programs to their default if not do this go to start menu to Default Programs then to Set Default Programs