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When you install a new application, your system will automatically create registry settings for it.  When you uninstall the application, some of its registry files will be left behind in the Windows Registry.  A Windows XP cleanup utility can detect such footprint and delete it from your system.  This makes Windows Registry clean and lean thus optimizing the performance of your computer.  So it is very important to run a full windows xp registry cleanup regularly in order to keep your computer in top shape.  You will not experience performance issues, errors, and system crashes if the Windows Registry is not cluttered with unwanted files.