Microsoft Blogger, Joe Stagner recommends "TweakUAC" to quickly Turn On & Off Windows Vista’s User Account Control (UAC)
Turn UAC off – This option turns UAC off completely. Windows Vista will operate pretty much like Windows XP does when you login to its administrator’s account.Switch UAC to the quiet mode – This option does not turn off UAC; instead, it only makes UAC to operate in the quiet mode. In the quiet mode, UAC does not display the elevation prompts for the administrators. That is, when you attempt to do an administrative task, you will be allowed to proceed automatically, without prompting you to confirm the operation. All other features of UAC would still be enabled: the programs will run with the standard user permissions by default, and the standard users will still see the elevation prompts (the quiet mode applies to the administrator accounts only).Leave UAC on – If you have previously turned UAC off or switched it to operate in the quiet mode, you can use this option to restore the original behavior of UAC.
Click Here for All Free Windows Vista Software