HP wireless audio kit, line-out stops working when in wireless mode

I recently hooked up my newly purchased HP wireless audio kit.

And the good news it is working as intended and the quality is ok.

But there is one big drawback, when I switch to the HP wireless mode and the music starts playing through my wireless attached speakers in the other room. The line-out (3,5mm jack plug ) from my computer stops working.

I don't want to switch between wireless and line-out every time I go from one room to the other but want to use both at the same time.

So my question is, is this possible? (this looks to me like a solvable software issue?)

Some information about my computer:

OS: Windows 7 Ultimate 64 bit

CPU: AMD phenom x6 1055

RAM: 16 GB DDR3

Mainboard: Gigabyte GA890GPA-UD3H rev2.0

Thanks for helping out, I hope there is a solution :)