Defrag and optimize Windows Registry. Quicksys RegDefrag is a freeware utility to defrag registry. It optimizes registry by removing gaps, fragments and wasted space in Windows registry files. It's easy. It's for you. Improve your computer performance with Quicksys RegDefrag 2009. The program does not modify any registry entries. Quicksys RegDefrag is compatible with Windows XP/2003/Vista/2008/Seven

What is Windows Registry?
The Windows registry is a central hierarchical database in Windows used to store information necessary to configure the system for one or more users, applications, and hardware devices. The registry contains information that is constantly referenced during operation, such as profiles for each user, the applications installed on the computer; and the types of documents each can create, property sheet settings for folders and application icons, what hardware exists on the system; and which ports are being used