Shutdown Icon is Missing

If the left button is missing so you can't assign it to shutdown your computer,
you may need to make a change to your Group Policy

1. Start
2. Run
3. regedit
4. Go to HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer
5. On the right hand panel, delete the key NoClose
6. Log off and back on again.

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Another method is using the Group Policy Editor

1. Start
2. Run
3. gpedit.msc
4. Go to User Configuration / Administrative Tools / Start Menu and Taskbar
5. In the right hand panel, double click on Remove and prevent access to the Shutdown, Restart, Sleep, and Hibernate commands
6. Double click on Disabled
7. Click on Apply and Ok
8. Log off and back on again.