Actually your other son's PC is attached to the network via Ethernet in that case but I won't go into the subtle differences.
As to your question then my original answer based on you being in different houses stands. There is no reason why a PCI 802.11 wirless card shou;ld not be able to connect to a Livebox.
BTW, you don't attach adapters ot network cards - network cards are adapters.
Having said that the Livebox does not have a very good reputation (which may be a refletion of the router or Orange support) and therefore I'd be inclined to use a better, more featured router. There are lots of threads here discussing the merit so the various brands/models. In fact I'd be inclined to read the comments on Orange as an ISP before going down that rout.
Terry
Edited by Beerhunter (Wed 06-Jun-07 09:26:24)