dell latitude - Cannot find 'Stereo Mix' on Windows 7

I have a DELL Latitude E6400 model laptop, on which installs a Windows 7 system. But I cannot find 'Stereo Mix' in 'Sound' -> 'Recording Devices', even if I try to 'Show Disabled/Disconnected Devices'. Hence I guess it's a driver problem.

My current driver is from DELL official website - R239286( IDT92HDxxxAudio ). Any ideas on how I can proceed with this issue?

Thanks.

Answer

I think Windows 7 hasn't got a 'Stereo mix' anymore. At least, it doesn't show in my Windows either (Realtek onboard soundcard).