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How to upgrade to Windows 7 64bit?
I have purchased Windows 7 Professional 32bit DVD from a retail store. After I have activated the key it shows OEM in the licence number. But now I want to upgrade to Windows 7 64bit. Can anyone tell me what should I need to do? I know that I have to a fresh installation formatting my system drive. But my question is will I have to purchase again Windows 7 64bit DVD separately or download Windows 7 64bit online and can use 32bit serial which I have to activate it?