As far as drivers, you wouldn't use the XP software.
A driver likley came with Vista if your printer is a fairly common one. If not, you might have to check the HP website to down load one.
If not you may be able to use a generic one.
Indeed. Take a trip through the Device Manager and click on Update Driver when you have located your printer. Vista will look through it's database for a better driver match if one exists. If not, try the HP website.