Hello everyone, i have one question for Windows user, those who know the each and every thing about the Windows please give me reply. I am using Windows 7 ultimate 32-bit. As I have received NFR copy of Windows 7 ultimate at the Microsoft launch. So my question is the license which I have received is of 32-bit, so can I use this serial key for 64-bit, I mean the same license key for 64-bit is valid or not. I want to upgrade to Windows 7 ultimate 64-bit. So please reply to this post. Thanks a lot in advance.