I already have 8.1 Pro on my PC. I want to do clean install onto an SSD. I have an upgrade disc to Windows 8 Pro but not 8.1. Is there anywhere I can find an ISO of Windows 8.1 Pro then reinstall and enter my valid product key? Also can the upgrade disc install a fresh copy of Windows 8 Pro. The problem is even if I could reinstall Windows 8 Pro from the upgrade disc I do not know what the product key was before I upgraded to Windows 8.1 which must have changed the product key. Can I somehow extract an ISO from from system while it is still running Windows 8.1 Pro then reinstall as a clean install? Thanks.