My Hard drive is showing incorrect free space. It is showing 17GB free in a 90GB hard drive but using treesize I have confirmed it should be showing about 45GB free space. My PC is also running very slow. Chkdsk finds problems like "Discovered free space marked as alloccated in the volme bit map and in the master file table bitmap" but when I run chkdsk /f nothing seems to change. Help appreciated. (I'm running XP Pro).