How to Repair Windows XP Registry Errors

1. Use RegCure (see References). RegCure has the ability to analyze every entry in your registry and point out which have errors. The RegCure software knows what a registry entry for a particular program should look like—if the entry on your computer doesn't match that 'correct' version, it obviously has an error. Once you get RegCure downloaded and installed, click 'Scan' to scan your registry and 'Fix All' to repair the errors.
2. Use Registry Mechanic (see References). Registry Mechanic operates in a very similar manner to RegCure. Once you perform a full scan of your Windows registry using the Registry Mechanic software, you will be presented with a comprehensive listing of all of the entries that were found to have errors. You can then click a single time on the 'Fix All' button to repair these registry errors and get your registry functioning properly again.
3. Use System Mechanic (see References). In addition to registry cleaning functionality, System Mechanic can also analyze other aspects of your computer to make sure the entire machine is functioning the way it should be. Open System Mechanic and click on the 'Registry' button to bring up the registry scanner. Click 'Scan' to scan your registry and 'Fix All' to repair the errors.