There is one and only working way to disable PC speaker beep in Windows for Acer Aspire One 722 (Acer AO722):
- Install original Conexant audio driver (otherwise PC speaker option won’t be available!)
- Go to Control Panel > Sound > Playback Tab > Speakers > Properties > Levels Tab
- Mute PC Speaker
There is also the disable Beep alternative. The same as above applies – it won’t work unless you install the original Conexant audio driver (for both x86 and x64).