How to revert to previous Windows?

2 Oct 2006
My pc was playing up a little so I decided to insert my Windows XP CD to repair and the option wasn't there. There was however, an option to install windows again but to 'leave files as they are'. Now I have a new installation of windows, and a second WINDOWS folder named WINDOWS.0, aswell as having all my old program files, is there a way to just revert to the older windows so I can have all my applications on the start menu, firefox settings etc?
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