If you own Lenovo S660 Android phone, you may want to connect your device to a Windows 7 or Windows 8 machine. By default, Windows does not come with the USB driver for Lenovo S660. So you will need to install the USB driver of Lenovo S660 on Windows before you can communicate between Windows and Lenovo S660. Here we provide the download link for Lenovo S660 USB driver that compatible with Windows 7 or Windows 8.
Please note that you must enable USB Debugging mode on your phone. You can set this from Settings|Developer Options.