i think the easiest way to do this is to turn on the cards ad-hoc mode in the software, then run the windows network wizard and tell it that others connect via your machine, this should then assign a ip ending in .1 to the wifi (probably with connection sharing) and then you can connec tto it with other wifi devices and use the internet from your ethernet cable.
doesnt your router have wifi anyway? its a lot of hassle to go through if it does.