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If we go through our day, working, getting dirty and picking up debris on our clothes and skin, we know that we can simply bathe away the problems and we are clean and ready to go again.  Our computers have a similar experience.  Their use brings debris and issues.  These are generally normal.  Sometimes, like us, they pick up bugs or illness that needs special attention.  We go to the doctor's office.  Your computer needs a visit from Techie at Large.  more info here