XP Pro Workstations

i have a server 2003, on a domain, 10 workstations, with a given number
sharing printers. All workstations are windows xp pro, mix of service pack 2,
upgraded service pack 3, and built on service pack 3. On some systems the
list in directory, is not an option when installing the printer, but on some
can still browse or run the unc name and see the printer, 1 system, service
pack 2, installed a new printer, list in directory works great, all systems
can attach, on a upgraded to service pack 3 system, list in directory is not
an option, can not access it from any workstation. Im also going to have to
rename the systems from specific names to generic work functions, for ex
workstation name, outside-sale, username quote. There are only 10
workstations, so at any given system only 9 others are attaching, so i know
im not exceeding the 10 connection limit....any suggestions???