Printer Driver

I am using an HP Pavilion 750n running Windows XP Home
edition. It is connected via LAN to Sony Viao computer,
which has a HP Laserjet 4100 connected. I can print most
documents from most applications on that printer without
problems, but anything involving the Ariel font will not
work properly. The characters are printed with spaces
between them. When I go into the printers and faxes
selection under control panel on my computer and go down
to the device settings tab - font substitution table,
plain Ariel is not there. When I do the same procedure on
the Sony Viao that is connected to the printer the Ariel
font is there. I have tried deleting the printer driver
icon and reinstalling it, but that did not help. I also
went to the server properties tab and tried to delete
that printer, but received the message "cannot delete -
the specified printer driver in use." I tried shutting
down all applications and rebooting and still got the
same message. Other computers on this LAN do not have
this problem. When I view the documents using the ariel
font on my computer, they look just as they do when
printed out, i.e. with spaces between characters.

What is the problem here and how can I fix it?