I am using :
Xonar soundcard : Headphone + microphone (2 * jack)
Integrated sound card : Philips amplifier (1 * jack)
I plugged the ampli on the integrated soundcard because i couldn't figure a better way to do so.
From that point, i though that it could be a conflit between the two sound card, but even with the amplifier unplugged (integrated soundcard not used), i had BSOD.