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The Registry is the essential part of Windows--a big, complex database that stores all the configuration settings for your software and hardware in a hierarchical form like file folders. You don't often need to deal with the Registry, because Windows' built-in tools work in the background to make sure it stays in tip-top shape. But because the Registry is so huge and complicated, it can develop troubles that cause strange problems or even bring your PC to a grinding halt.

To most of us, the Windows Registry is a dark and mysterious place. This month, we cover some basic housekeeping chores you can do to keep the Registry happy, and we review some Windows tips and tweaks that involve directly editing the Registry. If you're the adventurous sort (and are conscientious about doing backups), editing the Registry is the ultimate way to customize many Windows settings to your personal preferences.