I've got a friend's computer here, and he's got a 120gb drives, partitioned into a 14gb partition for the os, and a 99gb one for everything else. The 99gb partition is fine, but the 14gig one, the more crucial one, is not recognized under disk management. It says that it's healthy and active, but has no file system mounted on it. Is there any way to "repair" the file system, while not damaging or removing any of the files on the drive?