Buy Windows 7 full released version from the Microsoft Online Store. There are a few things you need to consider before purchasing your new copy of Windows 7; Be aware of the difference between The Update and The Full options(to Update you need to have a legit copy of previous Windows – Vista or XP) and make sure that you know the specifics of  the different versions of Windows 7 and figure out which one will satisfy your needs and will correspond to what you can afford. Keep in mind that Windows 7 Professional will satisfy most of any user’s needs for more information look at the chart below.