Windows 2000 Pro

I have a windows 2000 pro workstation with a 10gb hard drive. Noticed that drive c has 2gb of hard disk space. This workstation shows an unformatted drive D. When I tried to access drive D through explorer, I was prompted to format the drive, I answered yes. Received error that windows was unable to format the drive. How do I get this drive formatted or add to drive C. I also have programs and data on drive C that I need to keep.