Hi
You will probably need to change the wifi password back so the laptops can connect again, set up a new ssid with a new password, then push out the new settings via gpo. I think the password goes in the security tab when you create a new profile under Wireless Network Policies.
Once all the laptops have picked up the new settings, turn off the old ssid. If you have to have the same ssid as you had originally, you could repeat the process, but does anyone have time for that?
Andy
"He Who Dies With The Most Toys, WINS!!!"