vista asking for credentials when logging on to wireless net

This just started. The computer wouldn't boot yesterday. I disconnected and reconnected the hard drive and it booted fine. Today when I turned it on it wouldn't connected to the wireless network. I'm running a WRT120N linksys wireless router with a usb wireless card. When I try to connect to my wireless network it says "Enter?select additional log on information." When I click on that I get, "Enter Credentials." It asks for a user name, password and long on domain. I have no idea what that is. I've manually deleted and added the network 8 times. I've rebooted the router 3 times and the computer 4 times.

What is it asking for? None of the other computers on this network are asking for that.