<P> System File Checker (SFC) is a utility in Microsoft Windows that allows users to scan for and restore corruptions in Windows system files . Microsoft ships this utility with Windows 98, Windows 2000 and all subsequent versions of the Windows NT family of operating systems . In Windows Vista, Windows 7 and Windows 10, System File Checker is integrated with Windows Resource Protection (WRP), which protects registry keys and folders as well as critical system files . Under Windows Vista, sfc. exe can be used to check specific folder paths, including the Windows folder and the boot folder . </P> <P> Windows File Protection (WFP) works by registering for notification of file changes in Winlogon . If any changes are detected to a protected system file, the modified file is restored from a cached copy located in a compressed folder at% WinDir% \ System32 \ dllcache . Windows Resource Protection works by setting discretionary access - control lists (DACLs) and access control lists (ACLs) defined for protected resources . Permission for full access to modify WRP - protected resources is restricted to the processes using the Windows Modules Installer service (TrustedInstaller. exe). Administrators no longer have full rights to system files . </P> <P> Due to problems with Windows applications being able to overwrite system files in Windows 95, Microsoft has since implemented a number of security measures to protect system files from malicious attacks, corruptions, or problems such as DLL hell . </P> <P> System File Checker was first introduced on Windows 98 as a GUI utility . It offered scanning and restoration of corrupted system files by matching the version number against a database containing the original version number of the files in a fresh Windows 98 installation . This method of file protection was basic . It determined system files by file extension and file path . It was able to restore files from the installation media or a source specified by the user . Windows 98 did not offer real - time system file protection beyond file attributes; therefore, no preventive or reactive measure was available . </P>

Run the system file checker tool (sfc.exe) windows 7