You can try this. Open Device Manager and expand Sound, video and game controllers. Right click your audio controller (if you have two showing start with the top one) select Update driver software... and in the pop-up select 'Browse my computer for driver software'. Select 'Let me pick from a list of drivers on my computer', the resulting pop-up will show a list. The one with the blue tinted certificate icon is the one currently used and doesn't work. Start from the bottom if you have a list and click on it, then select the next tab. You might get an error warning that the device won't work if you install that driver. Just carry on installing. The sound icon might also show the red diagonal line. Reboot and let the driver install for a few seconds then try the volume slider on the speaker icon in the notification area. Repeat this untill you find one that works. If none work return to the original driver and keep checking windows update.
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