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Disk cleanup and Defragmentation.
Disk Defragmentation is most common in this situation.
the Disk Defragmenter feature
there is alot of things may cause that first check the OS drive free space then try to do clean up or defragmentation if it's not working try to use this program ACE utility this will clean all un needed files & temps & register entries >>>> if it still too slow than usual then no choice ( re-install OS )
