Stereo Mix recording option is greyed out (disabled). How to fix this?

[any ANONYMOUS forum user]

Hello.

I'm using Windows XP Pro SP3.

I have a problem with my sound. Under volume control, for "line in/mic in", the "stereo mix" option is greyed out (disabled). It shouldn't be. How can I fix this and enable my stereo mix?

In Windows 7, Vista or XP you can try to enable your Stereo Mix / Wave-Out Mix from the Control Panel, by updating drivers and installing alternative drivers:
Missing sound recording option "Stereo Mix" / "Record What you hear" / "Waveout mix"

Or you can use software that doesn't need a Stereo Mix for recording:
Audio/video recording software that allows to record sound without WaveOut/Stereo Mix (Windows 7, Vista, XP)