That might explain the port-forwarding problems I had recently. But astonishingly everything works fine now. I installed Windows from scratch and didn't install e.g. windows-vista codec pack. The problem with Vista seems to be that the devil's in the details...
Concerning the whole privacy thing I must say that I think that there's a lot of exaggeration on the web. For example the FBI worked together with Microsoft... Woooo, sounds quite fishy. But as far as I know they even worked together on XP. If they're spying, than you can expect that they aren't doing it for the first time with vista. And even if they do... What happens when using a pirated version of Windows? Nothing, barring that Windows won't work anymore... and therefore I don't believe that MS will send somebody to your door just because you burnt an audio or used P2P. Think that would be an expensive and very complex piece of work.
I'm far from defending Vista. Don't think something like that. But many things doesn't seem to be right. So somehow P2P works now (don't really know why, which is a nuisance), and I even can listen to a burnt audio-cd. But I still say: everything ran more stable under XP. I will self-test around a little while... and after that I'll weigh up, if it's worth trying to install XP. Hopefully you're right then and the people on the vaio-forum are just advertising for sony and therefore faking
