So i have a full package with windows 7 ultimate and the disc and so on. But I bought this desktop with Home Premium on it and I want to upgrade to ultimate. So i bought a new hard drive and wiped it and created a new partition with max blast. But Windows wont let me install Ultimate. It says missing drivers. HELP! When I try to boot it up it just says NTLDR is missing ctr alt dlt to restart. Your help will be greatly appreciated.