How does Win7 have no stereo mix?

Many users have installed Windows7 system, but they have a lot of trouble when recording or need to output microphone and background song at the same time. In fact, we can set up stereo mix to solve this problem. See the Windows 7 stereo mix setup method.
1. Right click on the small speaker and select the recording device.

2. Enter the recording device menu, we found that there is no stereo mix option, then we right click in the blank space, select “ display disabled devices & rdquo;.

3. At this time, the stereo mix option has appeared. Right click on the column and select “Enable”.

4. Right-click again after selecting it to select “set as default device”.

5. At this time, the stereo mix option has become the default device and is ready for use.