Easiest way to Disable UAC (User Access Control) is to modifying registry on the machine.
Manual procedure to disable UAC is given below
Click Start, click Run, type regedit, and then click Enter.
If prompted to enter your credentials, click on Yes to continue.
Navigate to the following registry subkey:
In the details pane (Right Pane), locate the EnableLUA key (REG_DWORD type).
Double click to Modify. In the Value data box, type 0 (zero), and then click OK.
Exit Registry Editor, and then restart the computer.