If you cant get back to normal, then you will likely have to just re-install everything. If there is still stuff on your computer you need, I would recommend getting Hiren’s BootCD, which is a boot disc with all types of tools. The most important one is a mini version of XP that allows you to get at all of the files on your HD so you can copy them off.
http://www.pcworld.com/product/1253966/hiren-s-bootcd.html
Of course it will have to be downloaded and burned first. But it will become invaluable in the future.
Mark for later when I have time to jack around with this.