Get a KNOPPIX CD and see if your files can be retrieved.
I have a second hard drive that I put all my backup on. I have put all my programs on it which includes all emails and games and everything else that I have. Something happened a few days ago that will not allow me to read all things on this second drive. I can read about 10 items when I click on drive D. Properties of this drive shows that it is 80% full but I cannot access 90 % of it. On my main drive I erased the entire drive and reinstalled Windows XP Pro which is working fine. There was no power outage or unusual shut down that caused this so I am baffled why I can read about 10 items but cannot open the rest. Your help greatly appreciated.