how does disk managment show that drive (healthy, unallocated, does it show all partitions its suppose to have, does DM show the entire size of the drive
if you wonder how to get into & navigate in DM
http://www.techsupportforum.com/hard...anagement.html
at this point I think you have a trashed partition
scan with this it wont fix until you pay but it may give more clues
http://www.majorgeeks.com/download4129.html