HDMI problem, no more analog signal from the soundcard?

well this is different.

where a million users have trouble getting their HD Audio interface working that way that it may offer sound at their display device in extraordinary great quality, i face a totally different problem, since my HDMI (only) equipped TFT does not have sound capabilities at all.

So i want to use my legendary old Speakers or my headphones in the analog output at the soundcards rear end.

But for some reason Windows XP concluded that HDMI is the one and only device, and shuts down everything else the very moment the windows welcome sound is played for a short moment on the analog jacks... nice

I checked everything, got newest drivers, even installed Windows multiple times and put an extraordinary old crappysoundcard™ into my PC just to figure that XP kind of hijacked my Audio in order to put it to an incapable device.

I would love to have an answer from someone with some insight what's going on here, since i run out of ideas