Hello, I am currently using Windows XP Media Center Edition on my desktop PC which came pre-installed from the vendor. I dont have any license/serial number for this OS. The PC came with a recovery partition on the hard disk from which I can boot and reinstall Windows XP Media Center Edition, if necessary. I have now ordered Windows 7 Professional Upgrade. 1. Will the Windows 7 Pro Upgrade version get installed/activated properly, given that I dont have the XP license/serial number? (Clarification: I dont need to preserve any data/programs. I can wipe out the hard disk completely) 2. Assuming the install/activation is possible if I start it from within XP, I am planning to upgrade my motherboard/processor/RAM sometime in the next few months. After this upgrade, I am guessing I would likely have to reinstall Windows 7 directly booting from the install-disk. Will the install/activation work now, if I dont have the license/serial number for XP? Any alternate suggestions on doing the Windows 7 upgrade and the upcoming motherboard/processor upgrade with only a pre-installed XP with no serial number, would be greatly appreciated! Would it, for example, help in any way to do the motherboard/cpu upgrade before the windows 7 upgrade? Not sure how I would install XP first given that I may not be able to boot into the recovery partition after the motherboard upgrade. If this is not going to work, I am going to have to cancel my Windows 7 Upgrade pre-order ASAP!