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Can I clear the system garbage of Windows XP/7, can it really improve the speed of the system?

  
Clearing the system garbage of Windows XP/7 can really improve the speed of the system?
It is actually an obsessive-compulsive disorder. That junk file, or some items in the registry that are not needed, can affect the system even if it has an impact? Every day is not necessary to clean up the junk files, and after inserting the U disk, do not stop right-click to refresh is the same ~
PS: Of course not cleaned for a long time, or some effect. It must be cleaned every day, no need.
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