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the best program is bluestacks
here is where you can download it, besides it supports different OS
http://www.bluestacks.com/
there are some third party softwares available. which enables the system to run android programs from windows platform. visit the link below to find the details of the softwares.
http://www.howtogeek.com/179691/4-ways-to-run-android-on-your-pc-and-make-your-own-dual-os-system/
like Bechir Massaoudi said http://www.bluestacks.com/ is very much user friendly