What Is the Best Registry Cleaner 2015? When your computer becomes slow, clean & defrag doesn’t solve all your problems, a good thing to try is registry cleanup. Deleting obsolete entries from your PC’s registry will make your software and operating system respond better and your computer run faster. But what is the best registry cleaner to choose? Let’s find out. First you should understand what the Windows registry is and how it works. The Windows registry is a massive database that stores every single setting for your computer – it’s responsible for your hardware, your operating system, your software, and all your user settings. Because of this the registry is accessed virtually all the time. The registry is also constantly updated with new data. For example, the registry is updated when you change your wallpaper, install a new program, save a document, or get rid of unwanted software. Because of the registry’s nature, it’s very important to keep it free of clutter. Obsolete entries and invalid references make the registry bloated, can make your computer really slow and result in various Windows errors. That’s why you need to find the right software and decide what is the best registry cleaner for you. There are plenty of registry cleaners to choose from – just go to Download.com and choose from hundreds of registry cleanup programs. But how to choose the best PC registry cleaner?