File Signature Verification in Windows 8

When installing new software on your computer, system files and device driver files are sometimes overwritten by unsigned or incompatible versions, causing system instability. Digital signatures help prove the authenticity of these files and ensure that it is easy to track changes that might cause problems on a system. It is a good idea to verify that critical system files haven’t been changed. You can do this by using the File Signature Verification utility.

1. Type sigverif in the Apps Search box, and then press Enter. This starts the File Signature Verification utility

2. Before you verify file signatures, click on Advanced option.

Note: The verification results are saved to a log file located %SystemRoot%\ System32\Sigverif.txt.

3. If you want to review the verification log, click Advanced, and then click View Log. Check the log to see if there are files that have been altered since they were installed. Files are listed by status, such as Signed and Not Signed. Note the modification date and version of the file. If a computer has been having problems since a certain date, and critical files were changed on this date, this could be the source of the problem.

4. Click Start to run the File Signature Verification utility. In the results, list of files displayed in the File Signature Verification utility report. These files don’t have digital signatures and could have been maliciously replaced by other programs of the same name. Click Close to return to the main window. If you suspect a problem, review event logs and other error reports to see if any of these files show up in the error reports.

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