WhatsApp is media social chat have many feature more than BBM in other mobile phone. its use mobile number ISP as PIN for invite friends. its also can be installed in mobile phone with OS platform Symbian, Blackberry, windows phone, Android and Feature phone Nokia.
Now, i want to share to you how to installed WhatsAPP on windows PC. In the Official site WhatsApp have no release support for PC or laptop version, no for windows, mac or linux. so you must installed bluestack in your system. after that you can install whatsApp via Bluestack software
Bluestack is Android emulator on any PC for windows and Mac OS. So, its can be run Android application on your PC.
Tutorial how to install whatsapp on wndows PC with bluestack step by step please see it below !
For detail information and Download Bluestack