I can not authorize my computer, it says "there is a fail internet connection" and almost say that "you can not connect to server"

I can not authorize my computer, it says "there is a fail internet connection" and almost say that "you can not connect to server", I modified the firewall and still does not allow me to authorize the computer. I use Windows 8, I hopeyou can help me, I bought e-books and can not read...thanks