Stu,
I have just setup a wireless network at home using a Dlink wireless router and a Dlink USB wireless card in my PC upstairs, we have 2 laptops one with a PCMCIA card (Dlink) and the other has an Intel Centrino wireless chip - and everything works a treat, what i will say is that the wireless PCI cards for PC's seem a little unrealible especially with XP (from experience).
http://www.dsl-warehouse.co.uk/product.asp?pr=DI614PLUS - Wireless router
http://www.dlink.com/products/?sec=0&pid=9 - PCMCIA Card
Basically the wireless router is an all in one unit, and it also has 4 ethernet connections for hard wiring PC's into it.
I have set mine up to use DHCP to issue my machines with IP addresses
but have given the router a static address so that i can administer it.
Now i am not an IT wiz by any standards, but i would recommend disabling all this WEP encryption - it just seems to complicate everything,
and unless you really understand how it works i would leave it well alone.
Hope this has been of some help to you ..... good luck :roll:
Stu.