[markd60]

Let me add some more details:
The exact message when I run chkdsk is:

The type of the file system is NTFS.

WARNING! F parameter not specified.
Running CHKDSK in read-only mode.

CHKDSK is verifying files (stage 1 of 3)...
File verification completed.
CHKDSK is verifying indexes (stage 2 of 3)...
Index verification completed.
CHKDSK is verifying security descriptors (stage 3 of 3)...
Security descriptor verification completed.
Correcting errors in the Volume Bitmap.
Windows found problems with the file system.
Run CHKDSK with the /F (fix) option to correct these.

78148160 KB total disk space.
7165184 KB in 39199 files.
11804 KB in 2771 indexes.
0 KB in bad sectors.
114652 KB in use by the system.
65536 KB occupied by the log file.
70856520 KB available on disk.

4096 bytes in each allocation unit.
19537040 total allocation units on disk.
17714130 allocation units available on disk.

Then, when I run chkdsk /f, it tells me that the the file system is NTFS and it can't lock the drive. can't run chkdsk because the volume is in use by another process. Would I like to this volume to be checked when the system restarts? I enter Y and restart the system, but it runs chkdsk, not chkdsk /f and does not fix the errors.
Is there a way to make chkdsk /f run or another program available that can fix my disk errors?
thanks