If you have had a virus, you may already have file corruption, run the following commands to ensure all is fixed, or you might want to consider formatting and reinstalling Windows and applications.
Open an Administrators CMD and Run the following commands in sequence:
C:\WINDOWS\system32>chkdsk /b /f /v /scan c:
C:\WINDOWS\system32>DISM /Online /Cleanup-Image /StartComponentCleanup
C:\WINDOWS\system32>DISM /Online /Cleanup-Image /AnalyzeComponentStore
C:\WINDOWS\system32>DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:G:\Sources\Install.wim:1 /LimitAccess
C:\WINDOWS\system32>SFC /SCANNOW
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