1, open the device manager. You can use the shortcut key Win+R to open the running dialog box, enter "devmgmt.msc" and press enter to open the device manager. Expand the port (COM and LPT) nodes. You can find the node in the left panel of Device Manager and click to expand it.

2. Enter regedit in Run of Start Menu, and then click OK to open Registry Editor. Follow the path below to find COMNameArbiter. Then click "right-click" on "ComDb" on the right and select "Delete". Then close Registry Editor and restart the computer.

3. Click the Start menu, enter cmd and press Enter. Enter the netstat-an command in the cmd dialog box that appears. You can see the usage of the port. You can also directly check whether a specific port number is occupied and enter the following command: netstat-aon|findstr port number.

4. On the computer desktop, find the computer, right-click and select Properties. After opening the interface, select the device manager on the left, and then you can find that the ports (COM and LPT) and the communication port (COM 1)COM 1 are in use. COM port is a serial communication port.