Eusing Free Registry Cleaner
The more software and hardware you install and uninstall, the more full your Registry gets. A great deal of software doesn't clean up after itself, and leaves behind old and obsolete Registry entries, or upon install creates invalid ones. There will be pointers to missing DLLs, listings of no-longer-valid file extensions, invalid paths, invalid ActiveX Controls, and much more. The more your Registry fills with this junk, the slower your PC gets and the more often you'll have system crashes.
Eusing Free Registry Cleaner helps to fix the problem in a simple, two-step process. Tell it to scan your Registry, and it goes through and identifies common problems and junk.
Then tell it to repair the Registry, and it tidies things up. Because changing the Registry can have serious impact on your system, the program lets you first look at the problems it finds, and tell it to only fix some of them. If you get into trouble, the program also lets you revert to the previous version of the Registry.