As I doubt I can install Windows 7 fresh on my new computer with the upgrade kit, I plan to install Windows Vista on my new computer, and then use the upgrade kit on it and hence get Windows 7 that way.
Now the question is will my Windows Vista laptop cdkey work on my new computer even though it's used already? Will Windows 7 upgrade kit made for Sony Vaio computers still work on another computer?
Well you would need to install vista on it, Meaning you would have to install Vista twice(Vaio,New Pc) then upgrade from that, you would be able to use that kit if you buy another version of windows vista, equivilent to the upgrade kits version (Home Premium Kit, Home Premium Vista)
you just try it, don't enter a key, nor activate it at install. then you search the internet for the key to edit in the register to turn the fresh install in an upgrade update. then you enter the windows key and try to activate it. if it works, you're good to go. if it don't do more research.
From what I've read, there is a distinction between the free upgrade, and a typical windows upgrade. The difference is the free upgrade is like getting a windows disk for free, versus the previous method of requiring a key from a previous version to validate the ability to upgrade. Thus, you should not need to have any install of windows present, or even a key, to activate the new free copy of windows (obviously you need the key that will come with it, just not a preexisting key )
Prior to performing an upgrade install of Windows 7 you must have a valid qualifying version of Windows (I.E. Windows XP or Windows Vista) pre-installed to validate the activation of the Windows 7 Upgrade product key.
With that said, you will not be able to install your Sony OEM upgrade version of Windows 7 of a computer other than that which it was intended for as you will not have a qualifying operating system installed and the OEM upgrade is for the original manufacturer.
Your new computer would qualify however for an OEM license of Windows 7 as purchased through and valid Windows 7 retailer.
Should you require additional assistance and feedback, Microsoft does have an official Windows 7 Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams.
is the distinction between the scenario I mentioned and the one you mention the fact that there is an OEM version in the mix? Or that the upgrade is from Vista? I understand an OEM version is tied to one machine, as well as being vendor specific. If I had purchased a PC with XP with a free upgrade to Win7, would I not have to do a clean install? Therefore, I wouldn't need a preexisting installation?
This particular question is asked very frequently here.