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.