Becoming very slow after for some time

why my acer aspire 4736 is getting slow or almost struck when multiple windows are opened and when i restart is everything is quite ok for some time.
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More about becoming slow time
  1. Did you check how much free ram you have?
    press alt + ctrl + del and see at tab performance how much ram is used and how
    much you have actually free.
  2. Physical Memory(K)
    Total 3073948
    Available 2413696
    System Cache 527332
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