Not sure what you are trying to do. Normally the Operating System (Windows) goes on the first Hard drive (your C: Drive). D: could be a real second drive or a virtual drive on your 'C:' drive. So are you trying to find data that you kept on D: drive or reinstall your system on your C: drive. I suggest a new post with an exact description of what went wrong and what happens when you switch on.
Terry
August 2006