I agree with Colin Barnhorst. Don't turn UAC off; use this free program
instead:
'Disable Annoying Vista UAC popups with TweakUAC (free!) » What is
TweakUAC?' (
http://www.tweak-uac.com/what-is-tweak-uac/)
What is TweakUAC?
TweakUAC(TM) is a free software tool that you can use to quickly turn
UAC (User Account Control of Windows Vista) on or off, or to make UAC
operate in the quiet mode:
Using TweakUAC is extremely easy: just download and run it, then select
the desired option on its window and press OK:
Turn UAC off
This option turns UAC off completely. If this is what you want, select
this option, press OK, restart the computer, and you won’t see the
elevation prompts anymore. 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.
Note that if you turn UAC off or switch it to operate in the quiet
mode, Vista starts displaying a warning message in its taskbar. You can
turn that message off, though: double-click on the shield icon in the
taskbar to open Windows Security Center. Then click on the Change the
way Security Center alerts me link, in the left panel. Finally, choose
one of the Don’t notify me options.
Note also that if you have used the Local Security Policy tool of
Windows Vista to change the advanced configuration options of UAC, they
will not be affected by TweakUAC; you would have to use the Local
Security Policy tool to modify them.