adding machines to french wireless

The vague recollection goes as follows:

Setup
1 wanadoo wireless router - dsl (apparently some pun on wan + zanadoo?)
1 iMac (new giant thick screen type, not bubble grid + color)
1 macbook G4 laptop (A's)
1 pc laptop - vista (J's)

The two macs are already connected to the network, no particular problems there, besides the fact that the wireless was not going to the third floor.

Found the 26-digit (hex) WEP password on the body of the router, but when attempting to connect to the router via the pc, encountered a 'connection rejected/refused/dismissed' type of message. From the g4, went to 192.168.1.1 to check the network settings, would only allow language selection. Attempted the same from the imac, selecting language (used french as a test, then proceeded in english) proceeded to a management page (admin/admin login). Went to the wireless tab, there was a whitelist of non-blocked mac addresses, ran [cmd] on the pc, then 'ifconfig /all', found the wireless device near the top along with its corresponding 10-digit hex mac address, entered the address and applied the new settings. On the pc, the wireless disappeared from the discovered list briefly, when it reappeared, the connection attempt gave a password prompt, which accepted the 26 digit one previously obtained - and voila, internet for all.

A wireless repeater [http://en.wikipedia.org/wiki/Wireless_Repeater] or an additional router (properly configured) on the first or second floor should solve the third-floor issue.