"Turn Off Computer" option is missing from Start Menu

READ it first!
Turn off Computer missing
For XP Professional:
- Click [Start] [Run] type [Gpedit.msc]
- [User Configuration] [Administrative Templates] [Start Menu and Taskbar]
- In the right pane, double-click "Remove and disable the Turn off computer
button" and set it to "Not Configured"
- Set "Remove and prevent access to Shutdown command" to "Not Configured"
- Restart
More information:
http://support.microsoft.com/default.aspx?kbid=307882
For XP Home:
Open Registry Editor (Regedit.exe)
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Set the NoClose value to 0
http://is-it-true.org/nt/xp/registry/rtips41.shtml

Ramesh ( SRamesh2k.RemoveThis@hotmail.com)
http://www.angelfire.com/dragon/sramesh2k/

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Special Solution

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Source
When you click Start Menu, the Turn Off Computer option may be missing. This is due to a group policy / registry restriction. To restore the missing option, try this - for stand-alone systems:
Resolution
NOTE: Backup the Registry before modifying. See this article for more information.

• Open Registry Editor by typing REGEDIT.EXE in the Start, Run dialog.
   
• Navigate to the following locations:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer

-and-

HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer

• In the right-pane, double-click the value NoClose and set it to 0.
  
• Restart Windows for the changes to take effect

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Source
Solution:
Disable the NoClose Group Policy from the registry.
(Note: Local Machine Administrator Rights may be required)
Read More
Launch RegEdit.

Navigate to the following location:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

In the right-pane, double-click the value NoClose and set it to 0.



Navigate to the following location:
[LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

In the right-pane, double-click the value NoClose and set it to 0.



Restart Windows for the changes to take effect

Registry Editor
Key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Value Name: NoClose
Data Type: REG_DWORD
Value: 0
Key: [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Value Name: NoClose
Data Type: REG_DWORD
Value: 0

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To restore the Group Policy with No Turn Off Computer Option.

Launch RegEdit.

Navigate to the following location:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

In the right-pane, double-click the value NoClose and set it to 1.



Navigate to the following location:
[LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

In the right-pane, double-click the value NoClose and set it to 1.



Restart Windows for the changes to take effect

Registry Editor
Key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Value Name: NoClose
Data Type: REG_DWORD
Value: 1
Key: [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Value Name: NoClose
Data Type: REG_DWORD
Value: 1