Hi there. Recently I purchased a product key for Windows 7 HP x64 over the phone for 108 dollars and was told that the price difference between product keys for Win 7 HP x64 and Win 7 Ult x64 was 0. I just cannot seem to remember where I purchased the product key, what number I called, I mean. With that being said, I need to purchase a Windows 7 Ultimate x64 Product Key. Does anyone know (verified 100% positive sources only please) where I can purchase a Windows 7 Ultimate x64 product key? Thank you for the responses.