X2 not recognizing soundcard

have you set preferences/audio/playback and recording and clicked on the share audio drivers? Does kontakt have any preference settings as to what audio drivers are set up?

You are sharing your audio interface with Windows, and Windows will 'grab' control of your interface anytime it wants to play any sort of sound, including for all the little beeps and blurps and such that it does by default.
 
First of all, I would suggest you consider turning off all Windows sounds.
 
2nd, I would suggest you leave your on-board sound chip to be the Windows default audio device, and use your audio interface ONLY for music applications, such as Sonar, or the stand-alone Kontakt, etc.
 
You could try to share between Sonar and other applications, I suppose - it would not be something I would choose to do.
 
Several of us have posted on another thread that we have our on-board sound as the default Windows device, and our interfaces are exclusively used by Sonar and other music applications, and we feed the speaker output from our computers into our interfaces to that all sounds come through one set of speakers.
 
Some other do something similar, but use a 2nd set of speakers for the output from the computer's speaker jack.  (I used to do this too, but switched to feeding it all into my interface as noted above).
 
Bob Bone
 

That's GREAT news, as I just ate WAY too much Chinese food and am about to go catatonic - too far gone to be of any further help at the moment.
 
I should be OK again in about 30 minutes, when I get hungry again.....
 
Bob Bone