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I have resinstalled my Windows 10 and now can't run Oracle Virtual Box guest OSes in 64 bit.

There is no bitness setiing in VB anymore

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Guest OS has 32-bit prefix now:

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Althoug image is 64 bit.

Error messages vary, most often is just black screen. If run Ubuntu installer, it explicitly fails due to bitness.

I have 64-bit host OS.

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I have Hyper-V diabled in Windows:

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I have Intel Virtualization enabled in BIOS.

I didn't find any VT-d setting in BIOS.

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What can be wrong?

  • "Correct" option was in unexpected place. I said that, virtual machines were existing already. It is strange that everything was saved in their profiles except bitness and the bitness was not in settings, but in OS dropdown. – Dims Dec 4 '16 at 20:52
  • First you said, that you judge "based on my answer", now you say it was "always" that. Okay. – Dims Dec 5 '16 at 7:38
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Incredible!

It was enough to set 64-bit here:

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