Open the Control Panel. (Classic View)
Click on the User Account icon.
Click on Turn User Account Control on or off.
To Turn Off UAC:
Uncheck Use UAC to help protect your computer.
NOTE: When you turn off UAC, the Security Center will give you an alert warning notification in the notification area of the taskbar until you turn UAC back on.
To Turn On UAC:
Check Use UAC to help protect your computer.
Click on Restart Now to apply the changes.
WARNING: This will restart the computer when clicked on. Be sure to save and close anything else running first.
Click on the User Account icon.
Click on Turn User Account Control on or off.
To Turn Off UAC:
Uncheck Use UAC to help protect your computer.
NOTE: When you turn off UAC, the Security Center will give you an alert warning notification in the notification area of the taskbar until you turn UAC back on.
To Turn On UAC:
Check Use UAC to help protect your computer.
Click on Restart Now to apply the changes.
WARNING: This will restart the computer when clicked on. Be sure to save and close anything else running first.