Windows Registry is a group of data files within the Windows Operating System that contain essential information for running Windows on a computer. Windows Registry runs all programs, user interfaces, and services that the Windows Operating System provides and is critical to a computer’s proper performance. Whenever a program is installed on a computer, Windows Installer places data in the Windows Registry to allow the program to run and access other Windows Operating System components. When these data files are lost, corrupted, or incomplete uninstallations or viruses modify them, the computer may not work properly or experience decreased performance. By using a software known as a registry cleaner, a user can repair the Windows Registry and improve his/her computer’s performance.

Free Window Registry Repair

Free Window Registry Repair is a free registry cleaner that allows users to repair Windows Registry by removing invalid registry entries, deleting registry file copies, and replacing missing registry files. Free Window Registry Repair also saves the current registry settings before making changes to Windows Registry so that the user can restore his/her computer if anything goes wrong.

CCleaner

CCleaner from Piriform is a free and highly popular registry cleaner that increases a computer’s speed and performance by removing unwanted files from Windows Registry. CCleaner, like Free Window Registry Repair and most other registry cleaners, also restores missing registry files and files that viruses or invalid information have corrupted. CCleaner also deletes the user’s browser history, temporary Internet files, and cookies that have been saved to the computer upon visiting websites or entering personally identifiable information.

Advanced System Care

Advanced System Care is possibly the most advanced registry cleaner available and is completely free. It allows users to clean invalid data entries, corrupted files, and duplicate files, from Windows Registry, while also replacing missing files. Advanced System Care defragments the computer, deletes personally identifiable information from the browser, and includes a comprehensive anti-virus software that runs fast scans and finds virtually any virus on the computer. Advanced System Care also includes a real time anti-virus shield that prevents malicious software from running or accessing Windows Registry.