Cross platform video chat

[DLS II]

Hi, I am in need of a cross platform video chat program. My son is in the US Army in Germany. His notebook computer is equipped with Windows 7. Our home computer is running Ubuntu 10.04.4 LTS and XP. I LIKE using Ubuntu. 1. it's FREE 2. worms,viruses,and trojans are pretty much a non issue 3. Microsoft sucks. I am not a software guru. Yes, I can go over to the DARK SIDE(XP) and use Skype-but I'd rather not if there is a workable Ubuntu to Windows solution. We have tried Skype(Beta) and Linphone but they both screwed up badly-not usable. Is there a SIMPLE solution? thanks, Don