What is most efficient way to close all instances of Windows Explorer ?

Let's say I have Nine instances of Windows Explorer Open. I can close each windows explorer window one at at time.  What is the fastest way to achieve this ?
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In the task bar , right click the exloprer tab then click close all, or (ALT+ F4)

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naseeamAuthor Commented:
Extremely fast and accurate response.
Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
If Windows XP while holding down the Ctrl key, click each folder along the task bar, then right click and select Close Group.

Windows7, right click the Folder stack in the task bar and select Close all windows
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naseeamAuthor Commented:
Usually we have multiple Folder Stacks in the task bar, I will have to righ-click a folder to close all it's windows.  Then, I would right-click another folder stack to close all it's window and so on.  

Is there an efficient way to close all folder stacks?
Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
When I said folder stack I was specifically referring to Windows 7.
Is you OS XP or Windows7?
naseeamAuthor Commented:
Windows 7
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