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Windows 7 has an internal utility to scan and repair the corrupted windows files.

C:\Program Files\Nmap>sfc /scannow

Here is the recent command of the

SFC [/SCANNOW] [/VERIFYONLY] [/SCANFILE=<file>] [/VERIFYFILE=<file>]

    [/OFFWINDIR=<offline windows directory> /OFFBOOTDIR=<offline boot directory>]

/SCANNOW        Scans integrity of all protected system files and repairs files with

                problems when possible.

/VERIFYONLY     Scans integrity of all protected system files. No repair operation is

                performed.

/SCANFILE       Scans integrity of the referenced file, repairs file if problems are

                identified. Specify full path <file>

/VERIFYFILE     Verifies the integrity of the file with full path <file>.  No repair

                operation is performed.

/OFFBOOTDIR     For offline repair specify the location of the offline boot directory

/OFFWINDIR      For offline repair specify the location of the offline windows directory

e.g.

        sfc /SCANNOW

        sfc /VERIFYFILE=c:\windows\system32\kernel32.dll

        sfc /SCANFILE=d:\windows\system32\kernel32.dll /OFFBOOTDIR=d:\ /OFFWINDIR=d:\windows

        sfc /VERIFYONLY

by JF