I currently have Windows 7 Home Premium 64Bit SP1 installed on my PC. I now have the full retail Windows 7 Pro 64bit SP0 Disk. How can I upgrade from one to the other without using Anytime Upgrade to pay for the upgrade? When I use the upgrade option from the disk it tells me to use Anytime Upgrade. I'm not paying for Windows 7 a second time.
Edit: I have a Genuine Windows 7 Professional Key and Disk.