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i made a back up copy of my computer (vista) after buying on 3 dvds,a few years later it now runs poorly,, my question ; can i use the dvds to reinstall windows vista on the separate partition "D", leaving all the original vista and my files and programs on "C" ,,so if anything goes wrong i can revert back to "C" working normally like before,, could i copy the dvds to partition "D" and reboot from there,, any help would be much appreciated

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