VT-x is not available (VERR_VMX_NO_VMX) on VirtualBox after Windows 10 Update

So in the mist of writing my “RMAN Back to Basics” series, I got the following error when trying to start my Virtual Machine in Oracle’s VirtualBox:

“Failed to open a session for the virtual machine dc1sbxdb001

VT-x is not available (VERR_VMX_NO_VMX).
Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}”

I was like, “How’s this possible?  I only just used my Virtual Machines yesterday!“.

Then I remembered Windows 10 had advised me it wanted to restart my laptop for some Windows Updates.  Probably something my work had pushed out.  So at the end of the day, I did “Update and restart” and it did take some time and several restarts.  Then I shutdown my laptop for the day.

After some googling, it seemed it was to do with Microsoft Hyper-V, so I followed my own instructions from my blog post:
Disabling Microsoft’s Hyper-V to use Oracle’s VirtualBox

And “Voilà” after a reboot my Virtual Machine started back up, so I could continue my blog series 🙂

Seems like in one of the Windows Update, Microsoft had decided to re-enable Hyper-V which I had previous had off on boot.


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Zed DBA (Zahid Anwar)

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