I've used Reg Organizer for over 10 years, since 2003. And I think there was an even earlier version. I used it on different computers starting from WIN95, then WIN98, XP and now on Windows 7. As soon as the system starts staggering, the Internet slows down - I run Reg Organizer. And the boost in performance is really here - after cleaning and optimizing the registry. The system never broke after using the program (honestly!). With other optimizers I sometimes had to re-install Windows. Thanks. I'll stay with this tool.