Unless I'm mistaken this this "software" based; please follow:
1. Install the HP Printer as a local printer from the Add printer wizard
from Start > Printers and Faxes.
2. After it is installed, Right click the printer and choose Properties.
3. Choose the Port tab.
4. Press Add Ports...
5. Press the New Port Type...
6. Browse to your HP port driver folder locally or on CD to get it installed.
7. Change to the port as you wish.
Cheers,
G