Follow the steps below and you should be able to turn-off the UAC feature easily.
- Just Enter "cmd" in the search Box under the Start menu
- Then right-click the highlighted result and choose Run as administrator from the contextual menu.
- Finally you will need to enter the following (as a single line):
reg.exe ADD HKLMSOFTWAREMicrosoftWindowsCurrentVersion
PoliciesSystem /v EnableLUA /t REG_DWORD /d 0 /f
Also, incase you would like to turn ON UAC anytime in future. Put the code below instead
reg.exe ADD HKLMSOFTWAREMicrosoftWindowsCurrentVersionPoliciesSystem /v EnableLUA /t REG_DWORD /d 1 /f