Printer on XP box keep loosing WiFi connection

This is a bit cross-platform talk part Apple related so I hope someone can help.

I have an HP color printer connected to an Dell XP box that I use for printing from my MB Pro and an iMac. All clients are wireless via an Airport Extreme Base Station.

Printing generally works fine but after a few days of inactivity, I loose connectivity to the XP box and can no longer print. I tunnel into the XP box via Windows Remote Desktop through XP/VMWare. Obviously when it looses connectivity I can't even log onto the box.

I'm wondering if this is a AEBS issue? I've turned off any sleep modes with XP and the WiFi card.

Any ideas???