Hanging of laptop after every 4-6 second

my dell laptop 500 gb harddisk, 4 gb ram, i5, window 7. it is hanging up after every 4-6 sec. now, videos and pdf files are not opening directly as before. not even scaning happaning fast. firebox is showing 'not responding' again and agian. right now, process 88, cpu 25% are showing task bar.
note:extra information are given
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More about hanging laptop second
  1. When was the last time you defragged and ran full virus and antimalware scans?
  2. the easiest way to solve your problem is to reinstalling your operating system... :)
  3. Hi :)


    All the best Brett :)
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