problem to connect multiple computers to wireless network under WEP encryption

[waterwin77]

I recently purchased a new Thinkpad laptop. It failed to connect to my Belkin wireless router (limited or no connectivity message) even after I typed in the correct network key. When I turned off WEP protein through my old Dell, the new one can be connected. I then re-enact the protection through the new one using the same key. Now it can be connected under the encryption but the old one is left out. Any suggestions? Thanks.