Error while opening sound device.....

Error while opening sound device. Please check input device settings and the project sample rate.

I installed audacity on two computers, both win 7 home premium and the audacity .exe file.

I’m trying to record sounds off youtube, on the one computer it works fine (laptop) after I enabled stereo mix control panel/sound/recording devices/show disabled devices/enable stereo mix.

On the second computer the stereo mix doesn’t show to enable.

Right. Self-Recording (Stereo-Mix) is not available on all computers. Some newer Windows computers leave it out. See if any of this helps.