Glitch

I had some problem with the sound. I alt+tabbed out of game, tryed to fix it , but didn´t work then I tought that CD was just too hot. I tooked it out and looked that i left the game open. I clicked it and it worked, without CD the game worked! And even better, sound was fixed. I could play without CD, I tryed. Then I exited to the windows and i tryed to open game it wouldn´t open. That´s just weird.