What have you tried already? If the answer is nothing, I would question your need to do it. Rooting presumes a certain prior knowledge of Android systems and if you don't have that basic knowledge, you won't benefit from rooting the device.
That said, KingoRoot will work in Windows when you download and install it. Connect the device by USB and start the programme. Make sure you download KingoRoot and not the inferior utility, Kingroot.