Fixing chkdsk error due startup.

I was experiencing my machine unable to perform chkdsk secheduled at startup. i was getting an error "Cannot open Volume for direct access". this is may cause of the hard disc has been block by antivirus software or any misc software like a firewall with advance hard disc monitoring. this problem / message will be prompted everytime machine startup.. i was trying to remove the registry entry to perform this chkdsk startup . check out the solution..

chkntfs /D

will delete the registry entry that runs chkdsk /f at boot, which should let defrag run or try :

chkdsk /X

If you have a bootable install cd for XP run chkdsk from the recovery console:Set your PC BIOS to boot from CDROM, Boot from the CD
Select the first option R Repair/Recovery ConsoleSelect your Windows partition by number (usually 1)
Login to XP with administrator passwordRun CHKDSK /P from the command line
Rinse and Repeat until no errors are shown, run CHKDSK /P :X for each drive letter (X)