How to Enable or Disable Windows Update Start Menu Power Button Alert in Vista

Information
This will show you how to enable or disable Windows Update from taking over and displaying the Install Updates and Shut down alert shield icon on the Start Menu power button, then installs the available Windows Update when you click on the power button instead. This is enabled by default in Vista.

Note

Warning
Disabling this option will prevent all Windows Update Install Updates and Shut down alert options from working in the Start Menu shutdown areas.
EXAMPLE: Start Menu Power Button with "Install Updates and Shut Down" Alert Enabled and Disabled
NOTE: You will only see the Install Updates and Shut Down alert shield if there was an available Windows Update to install.
OPTION ONE
Through the Local Group Policy Editor
1. Open the
all users,
specific users or groups, or
all users except administrators Local Group Policy Editor for how you want this policy applied.
2. In the left pane, click on
User Configuration,
Administrative Templates,
Windows Components, and
Windows Update. (See screenshot below)
3. In the right pane, right click on
Do not display 'Install Updates and Shut Down' option in Shut Down Windows dialog box and click on
Properties. (See screenshot above)
4. To Enable Install Updates and Shut Down Option A) Select (dot) Disabled or Not Configured and click on OK. (See screenshot below 5A)
B) Go to step 6.
5. To Disable Install Updates and Shut Down Option A) Select (dot) Enabled and click on OK.
6. Close the Local Group Policy Editor window.
OPTION TWO
Using a REG File Download
1. To Enable Install Updates and Shut Down Option A) Click on the Download button below to download the file below.
Enable_WU_PowerButton_Alert.reg 
B) Go to step 3.
2. To Disable Install Updates and Shut Down Option A) Click on the Download button below to download the file below.
Disable_WU_PowerButton_Alert.reg 
3. Click on
Save, and save the
.reg file to the
Desktop.
4. Right click on the downloaded
.reg file and click on
Merge.
5. Click on
Run,
Continue (UAC),
Yes, and then
OK when prompted.
6. When done, you can delete the downloaded
.reg file if you like.
7. Log off and log on, or restart the computer to apply.
OPTION THREE
Manually in Registry Editor
1. Open the Start Menu.
2. In the white line (Start Search) area, type
regedit and press
Enter.
3. Click on the
Continue button in the UAC prompt.
4. In regedit, go to: (See screenshot below)
NOTE: If you do not have WindowsUpdate in the left pane, then right click on Windows and click on New and Key. Type WindowsUpdate and press Enter.
HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsUpdate 5. To Disable Install Updates and Shut Down Option A) In the left pane, right click on
WindowsUpdate and click on
New and
Key. Type
AU and press
Enter. (See screenshot below)
NOTE: If you already have AU in the left pane, then skip this step 5A and go to step 5B instead.
B) In the right pane of
AU, right click on a empty space and click on
New and
DWORD (32-bit) Value. Type
NoAUShutdownOption and press
Enter. (See screenshot below)
C) Right click on
NoAUShutdownOption and click on
Modify.
D) Type
1 and click on
OK. (See screenshot below)
E) The registry will now look like this. (See screenshot below)
F) Go to step 7.
6. To Enable Install Updates and Shut Down Option A) In the right pane, right click on NoAUShutdownOption and click on Delete. (See screenshot above)
B) Click on Yes to confirm deletion.
7. Close regedit.
8. Log off and log on, or restart the computer to apply.
That's it,
Shawn