Registry setting for User Account Control (UAC)
User Account Control (UAC) is a Windows 7 in-built tool that protects your system and alerts you when you are executing some task that requires administrator privileges, however, if you would like to know how to disable UAC from the registry, here is the info:
To start the registry editor, type regedit in the Start menu search text box and press enter.
REG_DWORD (32-bit) Value name: EnableLUA
Value: 0 (1=enable, 0=disable)
A word of caution – incorrectly editing the registry may severely damage your system. The above modifications are intended for Windows advanced users who are familiar with the registry editor. Users are also reminded to back up the registry before making any critical changes.
It is always recommended to use the Change User Account Control settings link from Control Panel\All Control Panel Items\User Accounts to set UAC, and for enhanced security keep UAC enabled at all times. You can read more about UAC here:
Understanding UAC (User Account Control)
Comparing Windows 7 with UAC to Windows XP Behavior