I have a new printer to install, but need to take all of the associated software from my old one out... I can not understand my HP Paviulion, 20 All-in-OnePC's instruction, let alone find it for certain... How is the best way to remove the two old and install the new printer...? I have two to remove and one new to install. It will still leave me with two operable printers. And how do I find and know what USB port to plug into?