Open the Command Prompt as an admin and run sfc /scannow . This will safely scan and repair corrupted Windows system files.
Are you trying to or simply trying to speed up a slow computer ? Give me more details so I can provide the safest step-by-step solution! Do NOT use Registry Cleaners registry-reviver-4-23-1-6-full-version
If you want to clean out leftover files when uninstalling software, use a reputable tool like the Revo Uninstaller Free Version rather than wiping sweeping sections of your registry blindly. Open the Command Prompt as an admin and run sfc /scannow