For develpers who are testing and verifying installer changes sometimes we need to turn off UAC temporarily. It appears that sliding the UAC bar to the bottom setting and then rebooting does not appear to fully disable UAC.
The following registry key is still set to "1" after changing turning off UAC where it should be set to "0".
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"EnableLUA"=dword:00000001