I'd learn to turn down or up what I want to use.
Okay, well, I obviously have Windows 2000, and couldn't find anything about this problem involving 2000, only Vista and the like. First off, there's only one jack, a green one, no pink/red for the other plug. I do plug the green one in fully, and when sounds plays, it's still the speaker making the sound, not the headphones. Yes, these headphones do work, since on the last computer I had, they did. Even if they didn't work, the speakers shouldn't be making the noise. Secondly, I don't know how to find out what kind of speakers or whatever it is I need to find out that I have. If you need to know something about my system, ask, and be sure to tell me how to find it out.