Recreate the Show Desktop icon on the Quick Launch toolbar

To re-create the Show Desktop icon on the Quick Launch
toolbar, follow these steps....

1. Use any text editor (such as Notepad) to create a
file with the following lines:
[Shell]
Command=2
IconFile=explorer.exe,3
[Taskbar]
Command=ToggleDesktop
2. Save the new file as a file named Show Desktop.scf
in the WindowsSystem or WinntSystem32 folder. Note
that Notepad may automatically append a .txt extension
to the file name. Remove this extension if Notepad
adds it. These steps do not work if the file is named
Show Desktop.scf.txt.
3. Quit Notepad.
4. Using Windows Explorer or My Computer, right-click
the Show Desktop .scf file, and then click Create
Shortcut.
5. Copy the new shortcut to the appropriate folder. In
Microsoft Windows 95 or Windows 98, copy the shortcut
to this folder: WindowsApplication DataMicrosoftInternet
ExplorerQuick Launch
In Microsoft Windows NT or Microsoft Windows 2000,
copy the shortcut to this folder: WinNTSystem32
In Microsoft Windows XP, copy the shortcut to the
following folder: WINDOWSSystem32ConfigSystemprofileApplication
DataMicrosoftInternet ExplorerQuick Launch
6. Rename the shortcut to Desktop.
The Show Desktop icon automatically appears on the
Quick Launch toolbar.
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Reference:
http://support.microsoft.com/kb/190355/EN-US/