This article will show how to run System File Checker (SFC) to repair protected system files in Windows 7.There are a couple of ways to run the System File Checker (SFC) to verify or to fix corrupt protected system files on your system.NOTE: Windows 7 is no longer supported by Microsoft or Micro Center as the operating system has reached its end of life, this guide is available for those still looking for assistance with Windows 7. Further troubleshooting outside of this guide for Windows 7 is not available from Micro Center.Here is how to Scan and repair the System Files:1. Open a command prompt window with Administrator rights. 2. Type the command sfc /scannow and press Enter on your keyboard. This process will take some time to complete. *Warning: You should be aware that sfc /scannow will change any modified System Files back to the original default state. System File Checker will replace incorrect corrupted, changed, or damaged versions of files with the correct ones.How to verify if the System Files are Corrupt:1. Open a command prompt window with administrator rights. 2. Type the command sfc /verifyonly and press Enter on your keyboardYou should see a comment on the command window stating the files are ok or no file integrity violations were found.