Depending on your hardware and your current edition of Windows Vista, you can use the Upgrade option during Windows 7 installation to upgrade from Windows Vista to a corresponding or higher edition of Windows 7. Upgrading is the most convenient way to get Windows 7 on your computer, because it keeps your files, settings, and programs from Windows Vista in place.
If your current edition of Windows Vista can't be upgraded to the edition of Windows 7 that you want to use, you can still install Windows 7 by using the Custom installation option instead.
Please run the free Windows 7 Upgrade Advisor from the http://windows.microsoft.com/en-US/windows/downloads/upgrade-advisor Once this is done, you will have to get the Windows 7 from online store or a retail store and start the procedure. For the product details please check this http://windows.microsoft.com/en-US/windows7/products/home
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