I don't much like Windows software, being a user of Mac OS X. But I must use a PC some at work and it gets progressively slower day after day. So I cleaned the registry to see how it works and "poof" it's faster, at least a little. Also, this registry cleaner is one of the few that is actually free. At one time it cleaned only the first few entries and required a fee to clean more, but that has changed and now this product is totally free. But at startup is displays a nag screen asking for a donation. I don't believe freeware should display a nag screen, but that's the developer's choice. In my case I am not counting off for the nag screen because the product works so well. It is also fast and appears to do its job, that is removing garabe from the registry.