My PC came with a vista anytime upgrade and do I need to purchase vista home premium online to actually run the installer for it, or will purchasing it only give me a serial key? I have a serial key but I don’t have windows vista home premium. Do I need to purchase windows vista home premium to run the installer with windows anytime upgrade or can I run the installer and when it installs enter the serial key?

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Windows Vista Home Premium with SP1 Upgrade [OLD VERSION]Microsoft Windows Vista Home Premium Service Pack 1 Upgrade