Topic: digi96 and multiple programs

With my digi96 card I get sound only from program at a time.
for example: I listen to an mp3 in media player.
mediaplayer seems to "catch" the digi96 card.
Now I start Cubase.
There is no sound in Cubase now.
I have to close the browser, before I have sound in Cubase.

Is this behaviour normal?
Can it be changed by setup?

I got used to that situation, but now I started using Ventrilo, a communications software (
It is like skype conference but with better quality.
And using Ventrilo I can only hear one person at a time.
So I think that this is the same problem as above and related to the digi96 card.
Is there any solution to this?

HP Pavillion
2 GB RAM, 3 GHz
AMD Athlon 64 X2 Dual
Windows XP Professional Service Pack 2