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17 Sep 2011  

Windows 7 Ultimate SP1 64-Bit

As Karl rightly pointed out, you cannot upgrade to Windows 7 from Windows XP, it has to be a custom (clean) install, where you'll lose anything you haven't backed up. Also, all your applications will have to be reinstalled.

Upgrading from Windows XP to Windows 7 - Help & How-to - Microsoft Windows
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