For your convenience and protection Registry Mechanic can also make a backup of any repairs made so that you can easily recover any changes if required.
Registry Mechanic uses a high-performance detection algorithm to quickly identify missing and invalid references in your Windows registry. These problems can occur for many reasons including being left-behind after the un-installation or incorrect removal of software, by missing or corrupt hardware drivers, or orphaned startup programs.

Registry Mechanic Feature Highlights:
• Repair invalid registry entries that are a common cause of Windows crashes and error messages
• Optimize your system by compacting the wasted space and gaps in the registry
• Increase system speed and stability by removing orphaned references
• Scans your hard drive for invalid and incorrect program shortcuts
• Safely make backups of any registry change made by Registry Mechanic
• Works with Windows® 98, Me, 2000 and XP, with basic support for Windows® Vista™
• Unlimited free upgrades and e-mail technical support for one year

Homepage: http://anonym.to/?http://www.pctools.com/registry-mechanic/