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#71
For SFC:
1. Click Start
2. In the search box, type cmd
3. In the list that appears, right-click on cmd.exe and choose Run as administrator
4. In the command window that opens, type sfc /scannow and hit enter.
Report the output from the command window once it finishes.
More detail: SFC /SCANNOW Command - System File Checker
and CHECKSUR:
Troubleshooting with System Update readiness Tool