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What is the difference between windows 7 versions?
 

I am not that Windows 7 X86 Key savvy, so I do not know much. I Windows 7 Starter Serial just wondering what Windows 7 Ultimate Key is and how it is better than Windows XP. I managed to download a tool from Microsoft and it said that my computer Windows 7 Professional Product Key compatible for Windows 7. Now, how do I go Windows 7 Ultimate X64 getting Windows 7? Is it free to download or do I have to buy it? If so, how much does it cost?

How to install windows 7 before finishing the installation of windows xp?
 

I already have my Windows 7 Starter Serial set up a certain way and don't want Windows 7 Code to change - as far as the Windows 7 Serial goes. All my shortcut icons are set up and arranged in a very efficient way for myself so I don't have to search for Windows 7 Ultimate Product Key files/folders. Will upgrading to Windows 7 Pro 64bit screw this up?