PATGuard can only see what the PC presents to it. Basically PATGuard is poling the PC to give it permission to access a Com Port but either the are none available because of restrictions or they are being used.
Many things could cause this. I have had a look and its seems it could be a firewall issue, it could be that the com port is faulty, it could be in use internally somehow.
However, one thing to try would be to double click on the Bluetooth Icon in the icon tray at the bottom corner to access 'Bluetooth Settings' click the 'Com Ports' and click 'Add'.
Select 'Incoming' and then 'ok'
This should give you a com port that PATGuard recognizes.
Let me know if this works.