Can only connect Airport to networks that don't require passwords?

Hi,
I am able to connect my Dual USB 500 iBook to a linksys network that does not require a password, but there is an error trying to join my Airport Extreme network that does require a password. Yes, I have quadruple checked the password. This seems like a software glitch. Should I reinstall the OS? Is there a patch?
Jav

WEP or WPA ?
40/64-bit WEP is extremely fickle with passwords. It stems from the "hashing up" of the 40 bit (5 character) password into 64 bits. Different manufacturers (Apple, Netgear, Linksys, etc) can hash up with different formulas.
WPA can also be fickle, different manufacturers have different minimum password rules, some 8 chars, some 12 char, some 20 chars.

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