I have a borked Win 7 install that went bananas after I switched a 660TI for 560TI. I used System Restore but I think that did more damage because I symlinked my Users directory from C:\Users to D:\Users.
The positive, is that all of my data is safe (Photos/Music/etc)
The negative, is that my registry edits and symlinking have locked me out of the install unless I do a Safe Boot.
I believe I can restore the system if I am able to achieve:
Remove all user accounts from the system
Add 2 user accounts (Nick and Cathy)
Symlink from C:\Users\Nick to D:\Users\Nick
Put my original Nick folder in place and reset the security features (SID?) to the newly created account
Alternatively, I could reinstall Windows but I don't want to go through the hassle of reinstalling everything.--
-Stupidity, like hydrogen, is one of the basic building blocks of the Universe.
-Insanity: doing the same thing over and over again and expecting different results.