Cannot setup HPdeskjet from W98 to print on Win XP

I have a network with a W98SE and an main WinXP connected
to an HPdeskjet 720.
I am trying to use this printer as a network printer by
setting up from Win 98 computer.
I started by adding new printer from Win98 computer using
add printer wizard as network printer.
After I selected the network printer
\\main\printer...since my printer didnot appeaer on the
windows list, I selected "Have disk" and use my HP
original setup CD.
In the window where the printer name should appear, it
only shows "use setup.exe". I dont know how to do next.
I tried a diffrent way to install additional drivers from
win XP computer and it said..not electronically signed !!!
Anyone can help me
Jim