WLAN Transport protocol

Hello, I have a question not entirely related to freeradius.... We are running a wireless network and using freeradius with PEAP and MySQL for authentication. The whole setup works fine when the wireless cards have the WLAN Transport protocol Installed. But we are also working with some 20 USB wireless adapters that don't come with the protocol and don't give us the option to install it. Those cards aren't able to connect at all. Here comes the very noob question: is there a way to download that protocol or it has to be provided with the card/adapter itself ? Thanks for your help,