Cleanersoft Free Registry Fix - Version 2.0 An increase in registry key errors is one of the top reasons for slow PC performance, windows errors, and computer crashes. The registry is a database containing important settings for your PC. When it becomes cluttered, your computer's performance will suffer. With Registry Fix Pro you can clean and repair the Windows registry quickly and safely. It will search the Windows registry for unnecessary registry keys and fix registry errors. This will leave your registry smaller, less cluttered, and with fewer registry keys pointing to missing files. In the end, running Registry Fix Pro will speed up your computer's performance and leave it running nearly brand new again. For maximum safety, Registry Fix Pro will make a backup of the repaired entries. You will be able to restore any changes made using the software by choosing Restore registry backup.