How do I restrict wireless network access to specific devices/computers, using an Airport Extreme, when the WPA2 password is able to be found by other devices?

I have set up a wireless network in my office using a couple of Airport Extremes, and, for some reason, our Windows computers are able to view the password of the network. Well, given that we employ teenagers, you can imagine what happens when they all find out the password. We want to restrict network access to only those devices we deem necessary. How do I accomplish this?

SidMed wrote:
We need 18-20 devices to access, all wirelessly.
You can keep using your Apple routers as AP devices.. but get a router running a secure OS as the actual router that controls the network..
If you have 18-20 teens on the network.. then setting quota and restrictions on bandwidth is far more important than time..
Gargoyle on a cheap router can do it.. eg WNDR3800 or the newer W1024ND v2.
Simply turn off the wireless in these devices.. and use the ethernet connection to the airport as WAP.
Honestly you just will never get the security or control using apple domestic routers.

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