I did a fresh net install yesterday.
on the first run of AVWizard, the NVIDIA-drivers were not present., only the TV-Card was offered for sound. I went through it and in the end clicked on disagree. This brought me back to a black screen and a hang up. I rebooted, went through the wizard, this time with NVIDIA-drivers automatically loaded and with sound :-)
The only thing left now, is the missing setup for Mythtv under Computing. I know Phenigma told me what package I need to reinstall, but unfortunately I forgot.
Other than that, I seem to have trouble opening ports in the firewall.