System File Checker or sfc.exe is a utility in Microsoft Windows located in C:\Windows\System32 folder. This utility allows users to scan for and restore corrupt Windows system files.
>> 1 >> 
             Start 'Windows Module Installer Service'
Then try to run the command again.....
>> 2 >> 
             Windows + X keys together and then selecting Command Prompt (Admin)option from the Power user menu,  Type command : sc config trustedinstaller start=auto press enter.
Then you should get a Success message like “[SC] ChangeServiceConfig SUCCESS
After that, enter the following command and press the Enter key:  net start trustedinstaller
After entering the above command line, you should receive a message “The Windows Modules Installer service was started successfully“.
Now you can try opening the system file checker or sfc.exe on your computer as it will start easily.