quasar5456 reacted to energia in MSP432 no COM Port number assigned
As you noted, there is something going wrong with the port assignment in Windows. It could be that all comports somehow have been assigned already and Windows is not giving them up to other devices.
What does the Driver tab say in the device manager? Mine looks like the following.
Where did the driver you installed come from? Did you download it from energia.nu? Have you tried rebooting windows?