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I'm having a problem with Windows XP where at some point the volume control icon stopped appearing (even if I tick the checkbox in "Sounds and Audio Devices Properties"). There is a a few knowledge base articles on similar problems:

But neither of those work. Has anyone had this problem and solved it?

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Is your sound device driver installed? – r0ca Sep 2 '10 at 20:07
The soundcard works (and has the right drivers), and the Volume Control application works, it's just the taskbar icon that does not appear. – Sindri Traustason Sep 2 '10 at 22:37
Ok, did you try any of the answer I provide you? – r0ca Sep 3 '10 at 13:08
This happens to me sometimes; on some boots, the icon just isn't there. Rebooting fixes, but is an annoying operation to perform. – Core Xii Aug 20 '12 at 3:58

To resolve this issue:

Click Start, click Run, type msconfig in the Open box, and then click OK.

On the Startup tab, click System Tray (SysTray.exe) so that a check mark appears next to this item. Click OK, and then click Yes when you are prompted to restart the computer.

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This may be toward the right solution, there is no value named "System Tray" under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run Do you know what the data (command) for the value should be? – Sindri Traustason Sep 3 '10 at 21:59

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