Vista and older printers…

We just upgraded all of our PCs to Vista Business Service pak 1. I tested all of our printers, only by printing test pages. They all seemed to work with our Vista test machine.
Now many of the printers are showing up offline, or not responding to print jobs.
Some of the printers are HP 8100dn, HP 1022, Dell 5200.
I need direction to get these older printers to work on Vista.
At the same time we went from Netware 6.5 to Windows 2003.