Wise Registry Cleaner is the best free registry cleaner and registry optimizer, it speeds up your PC by cleaning your Registry. The PRO version help you improve your PC's performance by optimize your Registry, and it's so easy, you only need make a few clicks. The Registry is at the heart of every Windows computer. The older your PC is, the more junked-up its Registry becomes. Badly written programs (and there are plenty of those around) don't bother to clean the Registry when you uninstall them, and some programs add unnecessary junk to the Registry.