I own tryed yahoo, aim, skype but on aim i can individual hear him, on yahoo its really choppy, and skype kick me stale constantly.
Answers: http://guides.macrumors.com/Audio_and_vi...
With an HP I assume he runs Windows, hence probably have Microsoft Messenger. MS offer Messenger for the Mac, too. Try that. I haven't used the others that you have, but Messenger works great, near essay, nouns, and camera.
http://www.microsoft.com/mac/default.asp...