First you can always use Whatsapp Web Version If you don't want to use that then you can always download BlueStacks on your Windows and mac.

After that follow the instructions below.

1. BlueStacks.
2. Open Google Play.
3. Install WhatsApp.
4. Use your Number to activate.

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Roku Error Code 009 can be easily fixed all you have to do is restart your router 1 or 2 times. It will be fixed, I had the same error and by restarting the router it got fixed. Moreover, Install WiFi Master Key for PC and check your connection stats how it's working, is it connected or not.

I am also a Android freak i develop apps for Android Smartphones and the best thing i love about Android is that you can easily use and work on it because its open source. I am using AVG for my S4 and its best but i suggest that you can also use others to.
Norton
Avast
Mobile Security
Bit Defender

As i have told you that android is open source so keep in mind to give your personal info on apps. Just to tell you that Android is much better then IOS here is an example. I was using Whatsapp on my Laptop i tried installing it on Mac but it didn't worked.. Thanks to Techbeasts i can use most of andorid apps on my pc now here you go ..

http://techbeasts.com/2013/08/19/how-to-install-use-whatsapp-on-windows-pc-mac-guide/