All those who are investigating this, does the connection start working again if instead of rebooting the router you switch the WiFi on your laptop on and off? My router is in another room, and this...

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Is this a permanent condition now? Does rebooting the router and/or the other devices fix the issue temporarily? Be aware that a lot of users are complaining that the router just dies from time to...

What is the IP address that your network adapter gets when it is directly connected to the modem?

Default login page for WR740N is 192.168.0.1. It is very likely that the wired network adapter on your first PC is set up with a static IP address that is on a different network.

Thanks for clearing that up, ubertechieuk. burty: in the prperties of you connection, click details and see what IP address and gateway your network adapter is using.