I have a win7 box for reference now. Go to the network sharing center and on the left hand side select "manage wireless networks". Pick your AP from the list and right-click. Select properties. Make sure that 802.1X is selected and the encryption type is WEP. Network authentication is PEAP and select the settings just to the right of PEAP. Unselect Validate server certificate (this has a tendency to reset back to on if there is connectivity problems). Set the method to MSCHAPV2 and click the configure to the right. If your user credentials used to log in to Windows do not match Zentyal, uncheck this option.