Windows XP Pro Sp2 cannot boot: drvmain.sdb corrup

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Windows XP Pro Sp2 cannot boot: drvmain.sdb corrup - 01/24/09 07:52 AM

My Windows XP Pro sp2 PC is not booting.
It is giving the message:"C:\WINDOWS\AppPatch\drvmain.sdb"
is corrupted or missing". Safe mode is also giving the same message.I tried recovery cosole.Ran chkdsk C: /R. It completed
successfully.But after exiting from recovery console while booting getting the same error and cannot go beyond that.
I copied the file from from the original installation cd to
C;\WINDOWS\AppPatch directory.While booting it gave the
same error. Please help. Thanks in advance.