When you push the power button on your computer and somehow have time to brush your teeth, make coffee, eat a bagel, solve the energy crisis, design a better mousetrap and create a plan for world peace all before your computer finally starts up, chances are there's a problem. Hopefully, however, it's a problem that can be remedied without too much trouble. If this slow start up, as if it wasn't already bad enough, is accompanied with a few more error messages than you would like to see, I would reckon that you probably need to figure out How to Clean a Registry. Don't fret. There's a bundle of registry cleaners that are readily available. There's even a free registry cleaner or two out there. In this article I not only tell you about a few good registry cleaners, I also let you know a few things you can and should do to protect your computer and your sanity before you even begin cleaning a registry.