"you might not have permission to use this network resourse." error

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  i have a network with a pc(win xp) and a laptop(win7) that connected with my adsl modem/router togthder.

  my network worked good & i could shared my file between my pc and laptop,but recently when i want to open my laptop in network occurs this error .plz help me

  the picture of error is in this link

  http://i57.tinypic.com/21jrhb9.jpg

  Tuesday, February 25, 2014 12:12 PM