This is a powerful tool for Windows that allows you to scan and repair problems regarding registry files. By doing this, your computer will work faster and you will no longer get application errors.
However, if you want to uninstall it from your computer, you can go to Start -> Control Panel -> Add/Remove Programs (Windows XP) or Programs and Features (Windows 7), select and hit uninstall on the software. If this method is not working, I suggest you try using a third party tool that can forcedly remove the desired program by wiping all traces of its presence from the system. In this case, I suggest you check Revo Uninstaller. Additionally, you can try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.