Are you finding sfc_os.dll just press download button to get your sfc_os.dll file.
If some software in your windows OS wants sfc_os.dll your operating system will ask for DLL file. When that DLL file is not available you will get this error.
If you have moved your file or changed the name of dll file you will get this error.
You will mostly see there errors when you dll file is missing:
If you need sfc_os.dll Download it right now and install it into your system to fix the error as soon as possible. just Install sfc_os.dll and fix your error.