Despite my previous post, I decided to install Microsoft Windows Vista 32 on my HTPC. Installation went smoothly, running Windows Update revealed 48 updates to be downloaded and installed, so it took some time 
Next I started the struggle with the graphics card(s). The Gigabyte BIOS switches to the graphics board in the PCI-Express slot when you put a board in there. It works, but it will not allow to enable crossfire to have both cards running..... It took some time to find out that I had to change the BIOS setting back to the motherboard graphics board and after reinstalling the ATI Catalyst 8.3 driver it worked, at least within Windows......
Of course because of the change to Vista I also had to reinstall Media Portal, TV Server, etc... TV Server found an amazing number of channels on my @Home Digital TV signal. Firing up Media Portal was the start of a problem that up until now is not resolved. For one or the other reason when I switch on the TV in Media Portal, Media Portal crashes. Up until now I did not find a solutions for this problem, so please post a comment when you have a solution. Switching the system back to the Radeon 3400 board only, solved the problem, but it is not the way the system was intended to run. Hopefully I will come up with a smart idea on how to resolve this issue tonight.....
Next thing was testing the recording function of TV Server. I set it up to record the detective serie Lewis tonight. The system went into sleep mode automatically after one hour of inactivity, so let's see whether it wakes up ontime
. I will keep you posted.