Wanadoo LiveBox Advice

Hi All

Need some advice from anyone familiar with the Wanadoo Livebox. I have been asked by a friend to hook up another computer to the Livebox. At present they have a Mac laptop running of a wired port and an XP system with the Inventel wireless adaptor.
The PC they want to add is old running Win98SE, ive been trying to buy another Inventel adaptor to make life easy with setting up. However ive been told there is a 3-4 week delay on them.
I have now started looking to buy a 3rd party adaptor, but im rather dubious as to whether i will get it working. Wannadoo's support pages only outline how to connect a 3rd party device to XP.

Has anyone any experience with setting up a 3rd party adaptor using Win98 to a Livebox ?

Thanks
Ross