You not a computery widgit geezer then?
try: start menu/control panel/sounds and audio devices
then make sure there's a tick in 'place volume icon in the task bar'
If not, add it and 'apply'
If its there, un tick it, apply, then re tick it and apply again.
E90 330i 6MT gone. E91 335i 6MT gone. AMG E63 Estate gone. M6GC current...