Serial port enumeration failed due to limited access rights to windows registry

Enumeration of serial ports is done via the device manager "SetupDi.." API. The assignment of the serial port name is done with the windows registry (HKLM\SYSTEM\CurrentControlSet\Enum). If the access to this key is denied the serial port cannot be used. This affects the initial serial port enumeration and dynamically announced ports (virtual serial ports via USB).