No stereo mixer for sound recording in windows 7 | how to solve this!?

Hello

Please I've just found that there isn't any stereo mixer for sound recording in windows 7.

Any way to solve this issue!?

The stereo mixer is not shown up in the show disabled or disconnected mode when I right click and choose these 2 options from the list.

Please any way to solve this issue!?

Thanks a lot.