I am glad you got your printers working using older drivers. That won't always be the fix for this so I just wanted to post a comment in response to your "answer" to "never ever use drivers that are provided from HP site" and advise to "use original drivers from HP cd." There will be times where those drivers may not work and you will find the drivers on the site will work. There may also be cases where neither will work. The best advise is to not use host-based printers if you need a network printer, especially if Terminal Server, etc may be used. Host-based printers are really designed for local printing only (i.e. USB port connection) from my experience.
bol