Great. For the moment we will need just a bit more information. Your router IP address is going to be essential to getting into and looking for this key.
1. Do you know your router IP address? If not what operating system are you using and I can explain how we can find out. If you all ready know, could you please tell me the IP, subnet and gateway address?
2. When you are going through the install, does it tell you it actually sees your Access point.
3. During the setup it should have asked how you would assign the printer IP address, did you choose automatic setup?
Great, you can get all your windows IP information on Millenium by this method.
This will tell you your IP details.
One more question I just thought of that I was not clear on. After you found what appeard to be your WEP key, did you start your new printer install over again and input it then? It should prompt for this key during that install.