How to restrict internet particular user account in pc



I would like certain users in my company to be able to go to only company's website, while a few others canhave unrestricted access. The operating system is Wondows 7.
 


Using the Prental Controls seems to be a nuisance is windows 7. It is all or nothing proposition. I could not figure out how I could restrict certain user accounts to visit only my company's website while other users on the same computer to have unrestricted web access.
 

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