The sfc /scannow command is a powerful tool in Windows that helps repair missing or corrupted system files. Here’s how it works: - Open an elevated command prompt (you can search for “Command Prompt” in the Start menu, right-click, and choose “Run as administrator”). - Type sfc /scannow and press Enter. - The command will scan all protected system files and attempt to replace any corrupted files with a cached copy located in a compressed folder at %WinDir%System32dllcache. The %WinDir% represent