I saw this question http://superuser.com/questions/694349/how-do-i-repair-the-corrupted-files-found-by-sfc-scannow-windows-resource-pro, but it was for Windows 7. Running the `sfc /scannow` command on my installation of Windows 8.1 gave me this error:

>Windows Resource Protection found corrupt files but was unable to fix some
of them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For
example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not
supported in offline servicing scenarios.

I ran `chkdsk` and it found no problems.

Here is the complete log: http://sdrv.ms/1cOx19p

    C:\WINDOWS\system32>dism /online /cleanup-image /scanhealth
    
    Deployment Image Servicing and Management tool
    Version: 6.3.9600.16384
    
    Image Version: 6.3.9600.16384
    
    [==========================100.0%==========================]
    The component store is repairable.
    The operation completed successfully.
    
    C:\WINDOWS\system32>Dism /Online /Cleanup-Image /RestoreHealth
    
    Deployment Image Servicing and Management tool
    Version: 6.3.9600.16384
    
    Image Version: 6.3.9600.16384
    
    [==========================100.0%==========================]
    The restore operation completed successfully. The component store corruption was repaired.
    The operation completed successfully.