I have purchased Windows 8 Pro (through the offer), and activated it. I Installed Windows Media Center, and again, Activated It. I have formated my hard disk, and installed windows 8 and activated it, and again, installed media center and activated it.... Later, I changed my Motherboard and the CPU and the RAM, and now, I am obliged to activate. the activation throught the internet failed, So I activated through the phone... now I want to change my hard disk, so I need to format and install windows 8 again, but this time I have made an activation backup, and I wrote in the paper, the numbers that the phone operator given to me when I activated through the phone. I have these questions: 1- Is there a restriction in the number of activation can I made ? 2- Should I activate through the phone every time I format or the activation in the internet will succeed ? 3- what is the number that I give it to the phone operator ? does this number contain my product key ? 4-does the numbers in my paper can activate windows again without calling microsoft ?