When I bought the computer it came with XP and a Vista upgrade disk. It said it's an upgrade disk "only". Didn't try it yet to see if there is a repair option on it. I did find a Dell diagnostics disc. I ran it through a full test.
I got an error code that says a block has uncorrectable data or media is protected. Not sure if that has anything to with my current problem? It says the code and msg. can be used by dell to diagnose the problem.
Pop the upgrade disk into your machine, change the boot order to CD/DVD first and then boot from the disk. Go through the screens as if you were going to install but when reaching the install page look near the bottom and you'll see a repair option. Hopefully it will get you back into the machine.