Please watch the Video below to Learn How to Install Viber on Windows 7.
Step 1: Download Viber : [Http://download.viber.com/Desktop/Windows/ViberSetup.Exe ]
Step 2: When Download Completes. Open It and Click "Accept & Install".
Step 3: You May Have to Wait for Sometime.
Step 4: It Will Ask You Whether You Have a Working Viber Version on Your Smartphone, Choose Yes.
Step 5: Enter Your Country International Code and Your Mobile Phone Number
Step 6: Viber Will Automatically Send You an Activation Code to Your Phone, Enter the Code in the Empty Space, and "Accept the License Agreement".
Step 7: Now, You can start using Viber on your computer.