HOW-TO: Missing Volume Icon on System Tray

A friend of mine recently brought his laptop for me to check it out. His problem? The missing volume icon on the system tray.

This is the first thing I did:

Start -> Control Panel -> Sound and Audio Devices -> (tick) Place volume icon on taskbar

... and click OK.

The above is a recommendation from Microsoft KB279435.

Performing the above did not seem to work. So I dumped his registry and compared it to mine. For this kind of problem, check this registry key:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32]

Add wavemapper as REG_SZ (String Value) with value "msacm32.drv".

Logout and log back in. If this does not restore the volume icon, run "systray.exe".
Start --> Run.. --> systray.exe

Addition of the above registry key restored the volume icon on the system tray.

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