Internet Connectivity Problem - Windows 7?

I have 3 laptops all of which connect to the internet via my wireless router. 2 of the 3 are connected but the one doesn't get internet access. It shows I am connected to my router, but I have no internet access. I am unable to get on Firefox or Internet Explorer. Diagnostic tests gives me no help and I've... show more I have 3 laptops all of which connect to the internet via my wireless router. 2 of the 3 are connected but the one doesn't get internet access. It shows I am connected to my router, but I have no internet access. I am unable to get on Firefox or Internet Explorer. Diagnostic tests gives me no help and I've tried resetting my router. I've also tried using an Ethernet cable to connect the laptop but that doesn't work either. I have also done the winsock reset, a virus scan, and made sure the TCP/IP setting are automatic. The laptop is running Windows 7.
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