It'll work if you do the upgrade. The hard drive isn't part of the activation code calculation, so you're fine. Don't even bother installing Vista, just feed the 7 installer the Dell Vista disc when it asks for proof of eligibility. Saves you probably about a half hour.
Hello, I recently ordered a new hard drive for my Dell XPS 410. Originally this computer ran Windows Vista, then I purchased the Windows 7 Ultimate Upgrade for Windows Vista and installed/activated. Now, I want to replace my hard drive completely with the new one I have ordered but I cannot clean install Windows, and if I try to install the upgrade again it will not be genuine. So, I was wondering if anyone knew how to de-activate Windows 7 on one hard drive and re-activate it on another, I really do not want to purchase Windows 7 again. Thanks in advance.