Click on the Start button and in the search box, type Command Prompt
When you see Command Prompt on the list, right-click on it and select Run as administrator
When command prompt opens, copy and paste the following commands into it, press enter after each
el %windir%\Logs\CBS\CBS.log
sfc /scannow
Wait for this to finish before you continue
copy %windir%\logs\cbs\cbs.log %userprofile%\Desktop\cbs.txt
This will create a file, cbs.txt on your Desktop.