Have you tried other sound cards? Yes, for laptops we use USB external sound cards.
I cannot record in stereo-mix without a bad echoing but only in microphone setting. I have windows 7 64 bit and am using a Dell XPS 9100 STUDIO. I have been told by Dell support that it was a software problem and would have to pay to get help for it! Any help would be greatly apprecited.......thank you!