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I have a dual boot PC (Windows XP Professional / Windows 7 Home Premium 32-bit) on two partitions on my hard drive.

I have recently installed 8GB of RAM; how I can upgrade the whole configuration to Windows XP Professional / Windows 7 64-bit?

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Clean install 64bit over the old 32bit partition. – Moab Aug 18 '11 at 17:16

There is no way to upgrade from a 32 bit version of an OS to 64 bit version. You'll need to install the new OSs from scratch.

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