Why is the computer getting cleaner and slower?

  

Why is the computer getting cleaner and slower?



Reinstalling is best, the computer takes a long time, and it is useless to clean it.

It is best to reload it once in 1 year. I am doing this.






Clean up with 360, it will speed up a lot





Some systems are downloaded afterwards Deleted in the C drive will leave a residue, the memory is relatively large, more slower





may not be cleaned up, because the new application takes up space getting bigger. Reinstall the system and add a memory stick.



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