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When it's done, you'll see a summary of the results.

This will perform a full scan of your system, which can take some time. Provide admin permissions, then enter the following: sfc /scannow To run SFC, type cmd into the Start Menu to show the Command Prompt tool, then right-click it and choose Run as administrator, since you need to open an elevated prompt to run this command. Instead, you can use an SFC scan, which checks for invalid system files and tries to repair them when possible. Windows used to include a tool called ScanReg that checked for registry issues, but this isn't available in modern versions. You might not need to do a full reset, so try these tools first. And while the reset and System Restore options above are your best options for serious problems, Windows also includes some utilities to help scan for and fix corrupted system files. Presumably, you're looking to reset the Windows Registry to default because of issues on your system.