Wise Registry Cleaner scans the Windows registry for invalid or obsolete information and presents you with a list of potential problems. To help you decide which items to delete, the program classifies them as "Safe to fix" or "Not fully safe to fix".

A built-in registry backup enables you to undo any changes, should problems arise from a clean-up. Wise Registry Cleaner Free can also defragment your registry to further improve performance.

Features: Multi-user Cleaning Fix Registry Problems and Boost Your PC Performance Practical Backup/Restore Feature, registry is automatically backed up.
Scheduled Automatic Registry Cleaning System Tune-up Optimizes System Settings for Better Performance Customizable Cleanup Options for Advanced Users You can specify to run a normal, safe, or deep registry scan. Custom areas of the registry can be scanned for things such as invalid file extensions, obsolete startup program entries, invalid software paths, and many more. Exclusions are allowed, so you can tell Wise Registry Cleaner to avoid cleaning any registry items with specific words in them.

Portable version: http://www.wisecleaner.com/download.html or http://www.snapfiles.com/get/wiseregistry.html