To turn off UAC in Windows Vista, please take the following steps:
Step 1: Click Start / Control Panel
Step 2: Control Panel window appears, select Classic View mode and select User Accounts
Step 3: Select Turn User Account Control on or off
Step 4: If UAC is enabled, User Account Control window will appear, click Continue
Step 5: Uncheck User Account Control (UAC) to help protect your computer, click OK and then restart the computer to complete the process.