The Windows registry is the central database of Windows. It contains information and settings for hardware, every program installed on the system, and user settings. Whenever a user makes changes to Control Panel settings, or installed software, the changes are reflected and stored in the Registry.

Your registry keeps growing while you are using the computer. Over time, a large number of obsolete, redundant, and invalid entries and registry holes accumulate within the registry, causing it to grow at an unwarranted rate, and eventually damaging, corrupting, and fragmenting the registry. A good registry cleaner will clean up and fix your registry errors and make your PC run faster and more smoothly.

Perfect Booster gets our vote for the best registry cleaner. You can refer to the comparisons in the chart below: