Can't add second PC to Airport Extreme

I am trying to add a second PC to an existing network of one PC and an Airport Extreme. The new PC found the network and displays a solid signal. However, it then tells me I have "limited or no connectivity" and that the "network did not assign a network address to the computer." The Repair function says "unable to finish repair because renewing IP address cannot be completed." The firewall list allows an exception for the Airport. I've searched the forum and don't find anything specific to this problem. I would appreciate any suggestions.

Thank you Duane. After a break for the holidays, here is what I found on the original computer: The box is checked at "Distribute IP addresses" and "Use 10.0.1.1/24 addressing" was selected. Under Access Control, the list is empty. "All clients are permitted on correctly entering the password." So, I found nothing to change.
I'm also now getting a message that I need a network key (I had not seen this earlier). Looking under Wireless Networks on the original computer, I see 8 bullets in the Network Key field. It is set for WEP in the data encryption field, so 8 bullets doesn't seem right (I would have expected 5 or 13), but it won't accept a change. In the Net Authorization field, "shared" is selected. No combination of probable 5 or 8 letter keys will let me get past this barrier. Any further ideas are appreciated.

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