Restore the deleted "Show Desktop" icon
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The icon that is located in your task bar on the left.
When you click on this icon, you see the entire desktop all others
window/s will be minimize.

If you delete this icon then have no fear, you can replace it.
-open notepad
-type the following


[shell]
Command=2
Iconfile=explorer.exe,3
[taskbar]
command=ToggleDesktop


then save the file as "Show Desktop.scf" in 
C:\Documents and Settings\USERNAME\Application Data\Microsoft\Internet Explorer\Quick Launch

where "username" is replace by the actual user account name (which might be your name)