The setting should be on you router not Windows unless you installed the CD that came with it, and if that's the case then delete the Linksys software from Windows you don't need it.
You are correct, the pop-up is spawned by Linksys, but I have not installed any Linksys software. Indeed it comes from the router, but I've combed through the entire Linksys web administration page (accessed via local network @ http//192.168.0.1 but there is no option to disable it). I'm looking for some sort of hack, registry modification, or disabling of a Windows Service that would prevent the router from ever gaining access to my internet explorer.
As far as I know, all routers use a browser to manage their settings, I don't think there is anything to be done. (Naturally, I expect 30 seconds after I post this a MDL Expert will have the real solution). You could skip the the WiFi and use ethernet cable to reduce the chances of connection loss, but I imagine this approach is impractical. And finally, with all due respect, why are you embarrassed? These things happen. I certainly wouldn't let this prevent me from enjoying a fine meal if I were a customer. (Of course, one look at my 5'9", 400lb frame and it's obvious nothing keeps me from a fine meal).