Network Key?

I have an wireless network set up at home consisting of an old Orinoco
rg-1000 connected to an Linksys BEFSR41 cable/dsl router that I set up years
ago. I am trying to install an D-Link dwl-520 pc card on a machine running
xp pro but for some reason I can't get it to recognize my network. I get a
connection but that's all. I think it might be because I need to enter a
network key. My laptop which was set up originally has this network key but
I don't remember what it was. Is there a way I can reset the netwok key?