you will want to run one or the other. if you want to run windows wifi config (recommended) run wireless zero config. if u want to use the belkin stuff, run the belkin service. in either case, make sure only one is running to eliminate confusion.
also, i had windows update install drivers on one of the computers in my mother in laws house and it didnt work. you said u downloaded the firmware from the belkin site. if that is the case, download the drivers for the adapter. firmware and drivers are really two different things.