I'm using 250 GB Seageate Bercudda SATA HDD

When I did the CHKDSK using windows XP it displayed the following error
(C

CHKDSK is verifying security descriptors (stage 3 of 3)...
Security descriptor verification completed.
CHKDSK discovered free space marked as allocated in the volume bitmap.
Windows found problems with the file system.
Run CHKDSK with the /F (fix) option to correct these.

there are no bad sectors availabe in the HDD

then i formatted the partition C: with FAT32 and then reformatted it using NTFS and reinstalled the OS

After formatting i did the CHKDSK utility again, but the previous error was not sloved.

CHKDSK discovered free space marked as allocated in the volume bitmap.

What can I do to overcome this issue.

Any one pls help me immediatly

Backup data and low level format drive, re-partition and re-install windows.

Might be a good idea to run a full scan in something like MHDD after format, to check for (and re-allocate) any bad sectors.