why not connecting to viber in my laptop 2nd, 3 rd and other times?

[WPCentral Question]

I have android mobile and laptop too. I am using Viber on my android device. i want to be using on my laptop too. so i am downloaded viber on desktop for www.viber.com. but not connected to server. many times install and re install it. first time it working good but second time just say connecting to viber that it. Every time punch to my phone number but next screen don't come (activation window). My laptop acer ( Intel inside) os is windows 7 ultimate 64 bit. please help me.