I have mosx Lion have no driver for my photosmart c4580 printer and the printer test page gives no ip address. How do I get my printer to work?

We bought a new Mac bookpro using the latest version of lion 10.8. We also have a c4580 photosmart printer and have bee unable to find a driver down load for this printer and our Macbook. We have tried to use u tube and other sites including Apple support to try to connect to our printer. We run a printer test page and the ip address comes up "not applicable". Do we need to connect the macbook to the router? What are we doing wrong? HP site will not give us a driver download. I have to buy it. Seems simplar to goand buy a new printer but this one is still good. Can anyone help? We are not as software savy as alot of you out there. Thanks.