I also have encountered this issue with another Hermes-based card - Dell Truemobile 1150 MiniPCI.
Anyway...
according to the Linksys knowledge base, if you are using WEP with orinoco cards and a WAP11, you need to enter a hexadecimal WEP key, not the easy-to-use Alphanumeric one.
The kb article shows screen shots of the Orinoco client manager under 98/ME/NT4/2k, but under XP you would just need to enter the appropriate hex key in the proper places in the Windows dialogs.
http://216.237.158.84/cgi-bin/om_isa...W_ENU_JDocView