I'm using lenovo s660 running android 4.4.2 and i wanna root it?

I serched on web and found out how at the page http://mmxa116hd.blogspot.gr/2015/05/how-to-root-lenovo-s660-running-android.html
i followed all the instructions but when i try to install vcom usb driver from device manager(i run windows 7) it says that the folder that i entered doesn't include a compatible driver make sure thet has been designed for working with windows x64. What am i doing wrong? I try to install the driver for win7 x64. If anyone can help me please ket me know. Or you can suggest me onoyher way of rooting lenovo s660 running android 4.4.2 kitkat.
:)Thanks.