Hello, everyone I have installed on my machine the Windows version 7 Enterprise 90-days trial, downloadable from Microsoft's own site. I still have 10 days to use it. I liked Windows 7 and want to buy it definitely. But I have some doubts: - Can I activate this trial version with the serial number from a Windows 7 Ultimate? In other words, if I buy the 'box version' I can activate it using this serial? I would love to enable this version as it is, because in those 90 days many programs installed and I would not lose everything in one format. The problem is that I read the following information on a Microsoft FAQ about the activation of Windows 7 Enterprise trial: Q: What happens after the trial-period expires? A: If you wish to continue to use Windows 7 Enterprise please note that you will be required to purchase and perform a clean installation of Windows 7, including drivers and applications. Please keep this in mind; Windows 7 Enterprise is not available through retail channels. (Windows 7 Enterprise 90-day Trial FAQ's) So I'll be forced to make a new install?