http://answers.microsoft.com/en-us/windows/wiki/windows_10-win_upgrade/how-to-switch-from-32-bit-versions-of-windows-to/40d90c4e-8845-4bcb-bb2f-aeab312caf74
WARNING: There is no in place upgrade path from 32 bit versions of Windows to Windows 10 64 bit. The entire process is a clean install only. Which means, you will need to backup your personal files, reinstall software applications and reinstall hardware drivers.
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