>I am having a heckuva time trying to set up my "old" HP LaserJet 5 printer to work as directly connected to an XP machine, but able to be used from any other PC, whether Vista or Windows 7 on my local area network. When I went to add additional drivers, using LaserJet 5's own software, there were no options beyond XP drivers in the checkboxes.
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>How do I add Windows 7 and Vista Drivers as additional printer drivers to an XP machine so that the HP laserJet 5 printer on it will work?

You cannot install Windows 7 or Vista Drivers on WinXP and why would you want to do that?