Windows 2008, Vista, and 7 can reduce the potential of security breaches with User Account Control (UAC). UAC forces users that are part of the local administrators group to run as if they were regular users with no administrative privileges. Before disabling UAC, you should be aware of the security risks that disabling UAC can pose. For details of UAC, refer to the Microsoft Knowledge Base article How to use User Account Control (UAC) in Windows Vista.
To disable UAC in Windows Vista
Click Start > Run.
In the Run dialog box, type msconfig, then press ENTER. The System Configuration dialog box appears.
Click the Tools tab.
Click Disable UAC, then click Launch.
Restart the computer.
To disable UAC in Windows 2008
Click Start > Control Panel > User Accounts.
Click Turn User Account Control on or off. The Turn User Account Control on or off. dialog box appears.
Clear the Use User Account Control (UAC) to help protect your computer check box.
Click OK.
Restart the computer.
To disable UAC in Windows 7
Click Start > Control Panel > User Accounts.
In the User Accounts tasks window, move the slider to the Never notify position, and then click OK.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation. You will need to restart your computer for UAC to be turned off.
Click Restart Now to apply the change right away, or click Restart Later and close the User Accounts tasks window.