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Here is how to recover it?
Click Start, Run, and type Notepad.exe. Copy the following contents to Notepad.
[Shell]
Command=2
IconFile=explorer.exe,3
[Taskbar]
Command=ToggleDesktop
Save the file as "Show Desktop.scf" (with quotes, in order to prevent Notepad from appending .txt extension). Now, drag the file to the Quick Launch Toolbar.
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