WinXP 64 stops portmgr.vbs & printui.dll

I have used portmgr.vbs and printui.dll to install printers on my networks since Windows 2000. They have stopped working with the XP x64 version. When I run the command “cscript %windir%\portmgr.vbs -a -p PrinterPortName -h 192.168.1.23 -t raw -n 9100”, the script runs without errors but does not add the printer port. Since I need the port installed before I can install the printer driver, my way of automating printer installs does not work. Can anyone shed some light on how to automate IP printer installs for Windows XP x64? Thanks.