won't connect to the server for anything.

i recently fixed my computer for being a non guiene copy of windows. i then got internet. tried to connect to internet. was able to locate everything fine and easy. but when i try to open internet updates or anything on my computer that uses it. says it can't connect to the server. i think i might be missing files on my computer cause my windows media player will not open either. nore will my disk defrager defrag. i am losing my mind can someone help. please

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