Connection WiFi on Windows 7

I am system administrator for a network that has Windows XP, Windows Vista and Windows 7, the Internet worked very well for everyone until 3 days ago 3 computers that have windows 7 and connect wirelessly to the router stopped having internet connection.

If you do ipconfig/all, you can see the network card with an IP address, default gateway, and DNS servers, but for some reason it cannot go beyond the router. I ping the router but I can't go furter. All computers on the LAN have no problem. I updated the NIC, unchecked driver for wireless to save energy, I manually added the DNS servers. Nothing seems to work. Is there a solution for this?

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Tags: Windows

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