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I have a laptop with a 64-bit processor running Windows 7 32-bit.

Is it possible to install Windows 8 64-bit via VirtualBox on this configuration? Which version of VirtualBox do I have to download?

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Yes you VirtualBox can run a 64 bit guest on a 32 bit host OS, with some conditions, see the Virtual Box FAQ, quoted below:

VirtualBox supports 64-bit guest operating systems, even on 32-bit host operating systems,[11] provided that the following conditions are met:

  • You need a 64-bit processor with hardware virtualization support (see the section called “Hardware vs. software virtualization”).

  • You must enable hardware virtualization for the particular VM for which you want 64-bit support; software virtualization is not supported for 64-bit VMs.

  • If you want to use 64-bit guest support on a 32-bit host operating system, you must also select a 64-bit operating system for the particular VM. Since supporting 64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this support upon explicit request.

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