You can't create accounts for LINE, Viber, WhatsApp, Tango, Kik, etc. on the PC desktop. The whole registration process takes place on the mobile platforms where you can install these applications. If you have a smartphone, install LINE and create an account while using your phone number and register the account with your email address from the Settings menu then you can log-in on the Windows 8 version. If you don't have a smartphone, install Bluestacks and as an Android emulator, then use LINE and your phone to confirm the account's installation.