New Wireless Network Problem

I am setting up a new wireless network at home but cannot
get the wireless portion to work.

The base station is a MN-700 on a Win98 machine and I have
a MN-720 notebook adapter in a laptop running XP pro.

I am using a cable MODEM and have access to the internet
from the base machine and from my laptop if I connect with
a cat 5 cable. The network works.

When I try to setup the wireless adapter it sees the
available wireless network, same SSID the signal
is "excelent". When I try to connect I get a message that
says "the wireless security key (WEP) is not valid for the
selected network."

I have the security on both the base and the adapter set
to 128 bit. I have entered and reenter the WEP key many
times to make sure it is the same on both machines. Even
if I set the security to none on the base and remote, I
still get the error that the WEP key is not valid.

What am I missing?

Thanks for any help.