2 mics on the mixer, pc crashes?

I would like to connect 2 microphones to my PC. I bought a mixer for this and also connected it successfully via the audio input on the PC (AUX). If I now connect the first mic to the mixer, everything works properly. Now I plug in the second mic and speak into it, lubricate my laptop. The laptop is fairly new, I don't think it's because of it.

Try it with an audio interface.

Focusrite Scarlett 2i2 Gen. 3 or Steinberg UR22 MK2 are ideal.

Mixer + onboard sound is more of a half-baked solution.

No matter how the micro connects? Start with micro 2 at input 2. Then he micro 1 at input 1. Nothing? Then Micro 2 on input 1 and Micro 1 on input 2.

What's on the headphones? Can both be heard well?

Then all controls to 50%. Slowly raise the main controller to zero when both microphones are inside and what happens

I agree. With the Focusrite Scarlett 2i2 you drive top!