Like other Dual band routers, the linksys EA4500 broadcasts simultaneous 2.4 GHz and 5.0 GHz networks. The stock wireless card in the G75VW is capable of connecting to 2.4 GHz networks only. That is why your laptop can see and connect to the broadcast 2.4 GHz network and use the G protocol on that network. Your wifi card cannot connect to 5.0 GHz networks, so it will be unable to display the SSID of your 5.0 Ghz band running the N protocol.
If you configure the router to run b/g/n (typically an "Auto" setting) or "N only" on your 2.4 GHz network, you'll be able to achieve greater wireless speeds on your G75.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT