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Do you need to change your product key so you can activate Windows Vista, Windows 7, Windows 8 or Windows 10? There are two methods that will help you easily change the product key and activate.Method 1: Command Line UtilityYou can use a great command line tool that will help you do this very quickly. Just follow these steps:Here is the simple and easy way work on all windows editions include Windows 10, 8.1 and 7.Search for command prompt, right click and select run as administrator,Then Type slmgr.vbs...