Hello....
No Sound, No Volume Control, Mixer not Found, No Sound device installed…etc etc, This is a generic issue with all Windows OS updates....many of the users are facing this issue....this began after an auto update from MS changed many IRQs of Win OS, mainly the Sound and Audio Control system of Windows.
1 - R U facing NO Audio / No Sound issue...?
2 - Is ur Volume Control not responding ?
3 - Is ur Sound and Audio Device in Control Panel Grayed out ?
4 - Do u get a msg "No Active Mixer Devices Installed....when u try to open Volume Ctrl etc etc ?

If ur ans to any one of them is Yes...then u are being spammed by Microsoft....as ur Sound Control IRQ is being frozen by a recent update from Microsoft....
NOTE..THIS…IS…VERY..IMPORTANT...
No file update or any sound driver update can fix it, neither Microsoft is issuing any patch to fix it…or giving any help on this.
Full solution is available in my website (Support page)...it's quite simple process to fix it, and I am not charging any money, just trying to do some service and help everyone affected by this stupidity from Microsoft.
www.sureshayyar.110mb.com
visit my support page.
all the best...