Windows Media Center has taken over my PC

While trying to address another issue, I selected to open a program with default program. I evidently chose Windows Media Center.
Now, no matter what I do, WMC pops up. It pops up even when I try to open Freecell.

Tried to do a system resore but it gives me an "unspecified error".

My Live Mail and Internet icons in bottom tray have been displaced with small square icons with the WMC globe inside them.

I am currently using spare laptop.

Any suggestions please?

You could try this to restore all file associations to default.

http://www.sevenforums.com/tutorials/9154-default-programs-associate-file-type-protocol.html

This should get you back to where you started. We have many excellent tutorials here, written by some very knowledgeable people. Hope this helps, if not we're always here!