To delete a port
For this procedure, you must have the Manage Printers permission, which is one of several printer permissions
Open Printers and Faxes
On the File menu, click Server Properties, and then click the Ports tab.
In the list of ports, click the port you want to delete, and then click Delete Port.
Click Yes to confirm.
To open Printers and Faxes, click Start, click Control Panel, click Printers and Other Hardware, and then click Printers and Faxes.
If you are unable to delete the port and you know that you have printer permissions to do so, it may be that one or more of your printers is set up to print to that port. Reassign the printer or printers to another port, and then try to delete the port again. Deleting a port removes it from the available port list. Any printer that communicates through that port is disconnected.