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I'm trying to set up a virtual box windows 7 64 bit guest. The drop down shows 64 bit options but once my windows vm is installed, the guest identifies itself as 32 bit only. I have no clue why the guest OS is "demoting" itself to 32 bit. Anyone got an idea?

I'm using virtual box version 5.0.40 running on an Ubuntu host.

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    "but once my windows vm is installed, the guest identifies itself as 32 bit only. " - Then the iso your using is a 32-bit ISO. Additionally, update VirtualBox, 5.0.40 is ancient. – Ramhound Jan 21 '18 at 17:20
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    Official Windows 7 ISOs either install 32-bit or 64-bit version of Windows 7. If you end up with a 32-bit version of Windows 7 then you are installing a 32-bit version of Windows 7. There is no other explanation for your problem. – Ramhound Jan 21 '18 at 17:30
  • There used to be cases where VB would only support 32-bit guests. See here and here. – xenoid Jan 21 '18 at 18:11
  • @xenoid - Read the question again, the option is being listed, in those case the option for a 64-bit guest is not being offered. Entirely different problem. Please read the question again. – Ramhound Jan 21 '18 at 19:55
  • I just updated my virtualbox installation - same behavior. So I guess there must be an issue with my guest os installation. – Sebastian Sommerfeld Jan 21 '18 at 21:45

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