How to block a website in win 7

I can't block a website by the following procedure of win xp in win 7.In hosts file of win 7 gives no permission to save anything.Please can you tell me how to block the website?
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More about block website
  1. Tried modifying the hosts file?
  2. You have to right click on the host file first and uncheck "Read only".

    Then, you will be able to save after editing it.
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