Posted 13 January 2015 - 02:18 PM
You can't use a disc from another machine if you had one. It's an OEM copy and can only be used on that or an identical machine as it's tied to the hardware. And the OS would need to be uninstalled from the other machine. As an OEM copy can only be installed on one machine. Additionally that would be considered a new install not upgrade of the existing Vista OS. You would lose all the files and any software that was later installed on the machine. You would need to save the files prior to the Windows 7 install then make sure you have all the software and applications install files then reinstall after you install the Windows 7 OS.
I have no idea if your Windows 7 machine came with a disk. More than likely not and came with a recovery partition and you would have made a recovery disk from it.
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