Problem printing from Win 7 PC to AE Base Station connected Network Printer

Hi, i have an AE 802.11g version 5.7 software with an IP4800 canon printer attached via USB.

i can print perfecrtly to it from both my macs (G5 desktop and Intel laptop) running 10.5.8.

recently i connected my girl's Vaio laptop running Windows 7 and it works fine for connecting to the internet but i CANNOT for the life of me figure out how to get the network printing working. we installed the latest drivers for the canon on her PC and downloaded and installed Bonjour for WIndows version 2.02 (link here: http://support.apple.com/kb/DL999) The printer is even "seen" on her PC, shows up with a green arrow and the base station is identified, but everytime we try and print we end up with a "error printing document" message after a minute or so.

i have gone into the prefs and we have enabled the UDP port "5353" just in case her MacAffee or the firewall was the issue. this has not worked either. i have tried the solution proposed by a user on this link (http://www.sevenforums.com/network-sharing/177086-fixed-problems-wireless-printi ng-over-airport-extreme.html) and that has not worked either.

i have spent over 2 hours on this and am at an end to what else could work. Is there a solution? Can anyone help?

thx in advance for your feedback!

fj