EUREKA!!! It was the PC-Cillin Viruscan software. Now I'll just turn off viruscan and follow the link above to poke holes in XP's firewall whenever I want to use the receiver and I'm good to go. I even got it working through my wireless gaming adapter and everything works and sounds great! Thank you all very much for your help and suggestions. I will think of you all when I am partying to my new outdoor 'Rock' speakers powered by my fully-functional (and now wireless) Rio Digital Audio Receiver. Thanks again,

Architect Smurf (A.K.A. Kurt H.)