Hi,
Please run System File Checker (SFC) to repair Windows Vista system files
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1. Click Start, type "cmd" (without the quote) in the Start Search bar, right-click cmd.exe and click run as administrator.
2. Input the following commands and press Enter after each line.
sfc /scannow
Note: There is a SPACE between "SFC" and "/Scannow". This command will take several minutes to complete.
Restart the computer.
For more explanation, please refer to
http://support.microsoft.com/kb/176646
Regards,
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