Method 1: Manually re-create the Show Desktop iconClick Start, Run, and type Notepad.exe. Copy the following contents to Notepad.
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.[Shell]
Method 2: Using the Regsvr32 commandClick Start, Run and type the following command:
The Show Desktop icon file should be available now.regsvr32 /n /i:U shell32.dll
Method 3: Copy the file from another user accountEvery user account will have a copy of Show Desktop.scf file. Search for the file named Show Desktop.scf in your computer by logging in as administrator. Copy it to your user profile path here:
(Type the above path in Start, Run dialog)%Appdata%\Microsoft\Internet Explorer\Quick Launch