Bluestack is an Android Emulator that available for your PC
Your pc must have a minimum of 2gb RAM so that you can install Bluestack
and must have a Graphics card that compatible for bluestack
You can download bluestack in their website. http://www.bluestacks.com/
then wait it to finish its installment.
and login your Google account and download Clash of Clans in Google Play store in your bluestack
install it and you can play it and it is easy to use
You can play some android games too here at bluestack just search it in your Google playstore