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I installed virtual box on my 64 bit windows 7 operating system. Now i am planning to install redhat 64 bit on my virtual box , however my virtual box is not listing any 64 bit operating systems during the setup.

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From VirtualBox manual:

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

  1. You need a 64-bit processor with hardware virtualization support (see Section 10.3, “Hardware vs. software virtualization”).

  2. 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.

  3. 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.

Check if you have hardware virtualization enabled in BIOS/UEFI.

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