It's complicated...XP can't see USB printer on Airport

I have the following:
Imac running Snow Leopard 10.6.3 with Parallels 4.0.3848 running XP.
and
Airport Extreme Base Station (AEBS) and Airport Express (AE) used to extend the wireless network.

AEBS WAN port is connected to cable modem
Mac connects to AEBS wirelessly and therefore to AE wirelessly.
AE has a USB printer (HP CP1700) and a stereo connected to it.
Mac prints and streams music through AE with no problem.

Parallels XP connects to AEBS via ethernet LAN port and gets internet access, but can't see the USB printer connected to AE. I have to disconnect the printer from AE and connect it to Imac USB port for XP to see and use the printer.

I have printer sharing selected in System Preferences, and, shared networking selected in Parallels preferences.

AEBS is set up as to be a wireless network. AE is set up to extend the wireless network. The printer, connected to AE, shows in the AE printer list. It does not show in the AEBS printer list.

Any thoughts or suggestions on how to get XP to see this printer via this AEBS/AE configuration?

Also, I will be connecting an ethernet printer (Konica Minolta 7450II Grafx) to AEBS via one of the LAN ports. Any thoughts on how this needs to be configured to allow both Mac and Parallels to print to it?

Thanks in advance for your ideas.

JD Hadley