You can disable User Account Control (UAC) in Windows Vista with msconfig.
Click Start - Run, Type msconfig
Click OK
Click "Tools" tab
Scroll down & you will see "Disable UAC"
Click on that line & Press the Launch button
A CMD(Command) window will open. When the command is done, you can close the window.
Close MSCONFIG.
You need to restart the computer for changes to take effect.