You must run an elevated Command Prompt to perform an SFC scan. To run Command Prompt, type 'command prompt' in Search, right-click on 'Command Prompt', and select 'Run as administrator' from the drop-down menu to run it with administrator privileges. The 'sfc scannow' option is one of several specific switches available for the SFC command, the Command Prompt command used to run System File Checker. System File Checker is a Windows utility that allows users to scan for corruptions in system files and restore them. Combo Cleaner is owned and operated by Rcs Lt, the parent company of read more. You will need to purchase the full version to remove infections and eliminate computer errors. It is recommended to run a free scan with Combo Cleaner - a tool to detect malware and fix computer errors.