To turn UAC off in Vista, hold sown the Windows key and press R on the keyboard.
In the box that appears, type msconfig and click OK or press the return key.
A box will open with several tabs. The tab on the far right is the one you want.
Scroll down the list until you see a setting (and you have to read carefully) that offers to disable UAC. Click it once, the click the Launch button at the bottom of the window.
A Command Prompt box will flash open. Type exit to close it.
Reboot the machine. UAC is now off, but you will get warnings from the system tray that UAC is off. You do not need to restart UAC so click whichever option you need to to ignore the reminder. But better to turn the (really annoying) reminders off.
Click on Start > Control Panel. Click the Security tab, followed by Security Centre.
On the left-hand side of the new window, click Change the way Security Center alerts me.
If you want no notification at all, select the bottom option: Don’t notify me and don’t display the icon. Otherwise, use Don’t notify me, but display the icon.