Seems like Windows 7 is loading his own printer drivers
, that are very generic, useful for emergencies and little more. It's remarkable that they work at all on so much different devices.
Did you install the right drivers?
From HP's site they say there are 5 different kinds of HP5550. please locate the manual or something to identify your printer, then try going here
, select the printer you have and then on "microsoft windows 7 64 bit", then download and install the latest Universal Printer Driver
Another thing that may help is the latest HP Print View software, from that same page, which seems to be a more advanced print utility. (HP Print View Software is a suite of tools that can help you produce professional-quality marketing material by using your own HP Printers.
Try both and see if you regain control of the printer, then report back.