If you can enter in the admin interface of your router, from “192.168.1.1″ and you see that everything is fine, there is one thing you might miss.
The router will not display that the network UTP cable is unplugged and you will think that the issue comes from the router’s settings.
To test this, plug the UTP cable directly into your network card from the PC and see if you get the network unplugged icon in systray. You can also disable and enable the network as sometimes even if the cable is fine, it will still show that the network cable is unplugged.
Check the cables, if you see that the network is fine after plugging the cable directly into your PC, connect the main cable to your router and set the wireless connection to another channel (not on the default one).
Select channel “10″, “11″ or ’12″. These channels are important because sometimes your wireless connection from your router might interfere with the connection from another router that is in your range.
Reboot your router either from the web interface or from the button after you modify the channel.