For some reason vista is picky about adding printers, especially networked
printers. In the past week or so I have spent hours working to get a few of
my users printer back working after an upgrade. The main problem is it seems
to freeze up or take excessively long to connect to network printers or copy
drivers from a print server. One trick that I learned is to restart the print
spooler service and it gets the printer back working as it should. I hope
this helps someone.