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Possible Duplicate:
How to upgrade from Windows 7 x86 to Windows 7 x64?

What's the [best] process to upgrade a computer from Win 7 x86 to Win 7 x64?

Community
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Ole Eichhorn
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    Duplicate question, see my answer: http://superuser.com/questions/167509/how-to-upgrade-from-windows-7-x86-to-windows-7-x64/167510#167510 – Tamara Wijsman Aug 16 '10 at 00:46

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While there is no direct upgrade path across architectures, you can use Windows Easy Transfer on the 32-bit machine to transfer all of your files and settings to the 64-bit machine.

John T
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You should remove old 32bit and install new 64bit version of Windows 7 in your system.

NASSER
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