[Solved] VBox is not working after Hyper-V installed

[Shah P]

Hello, long story short, I had VB working with Win7Pro in a Win10Pro host. I needed this setup to run some work specific softwares which would not run in windows 10.
I had the VB working perfectly, win7 recognized my usb devices as well. So I got this crazy idea to see if I can carry out the same thing in Hyper-V.
I could not figure out how to get the wind 7 installed in Hyper-V. So I uninstalled it and since then My VB no longer works and gives me the following error message.

Failed to open a session for the virtual machine wiTECH.

Raw-mode is unavailable courtesy of Hyper-V. (VERR_SUPDRV_NO_RAW_MODE_HYPER_V_ROOT).

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

I have done the repair installation, uninstalled and reinstalled, erased all the VMs and still doing the same thing.

any help is greatly appreciated,
Also, is there a way to have Hyper-V and VB installed at the same time with out messing up VB?
Thanks
Shah

[BillG]

No, they will not work together. When Hyper-V is installed, the hypervisor loads before the OS. Your host is running on top of it so it is not in direct contact with the hardware.

The closest you can get is to have two separate boot entries, one with the hypervisor enabled and one with is disabled. You can then go from one to the other with a reboot.

https://marcofranssen.nl/switch-between ... n-windows/

[socratis]

Oh, and please don't forget to complain to Microsoft about their does-not-play-nice-with-others behavior/attitude! Loudly!!!

VMWare and VirtualBox can run fine at the same time. If Hyper-V is installed (just installed, not even running), neither VMWare nor VirtualBox can run!

[Shah P]

After tinkering with hyper-v for a bit, I found out win 7 installs on Gen 1, but not 2. Gen 1 doesn't support usb pass thru. So I finitly need to get VBox working again. Hyper-v is uninstalled, but I still get the above error message. How do I get VBox workimg again?
Thanks.

[socratis]

After making 110% sure that Hyper-V is disabled in the Windows Features, you might want to make sure that Fast Boot is disabled and do a cold boot (i.e. shut down the host for a minute or two).

You also must make sure that nothing else is using Hyper-V, things like antivirus, debuggers, emulators, etc. Check out the article "I have a 64bit host, but can't install 64bit guests" to get some ideas...

Open an elevated Command Prompt (right-click, Run-as-Administrator) and execute the commands:

• dism /Online /Disable-Feature:Microsoft-Hyper-V
  bcdedit /set hypervisorlaunchtype off

[Shah P]

Thank you very much, I got VBox working again.

[socratis]

Great, I'll mark the topic as [Solved], but do you mind sharing with the rest of us what was it that actually fixed it?

[Shah P]

I went to windows services, stopped all hyper-v related services, then went to windows features and uninstalled all hyper-v related features EXCEPT hypervisor, then uninstalled VBox. Rebooted and installed VBox again and it worked, no more errors.

That was before I saw your respond with the commands, so i didn't get to try out the commands.
Thank you all, there was a good amount of info in the responses and it helped a lot.

[socratis]

uninstalled all hyper-v related features EXCEPT hypervisor

I'm sorry, but I don't quite understand that part, could you either clarify, or include a screenshot so that we're in the same page?

uninstalled all hyper-v related features ... Rebooted

That's what did it! There was no need to uninstall/reinstall VirtualBox, but a clean start never hurt anyone...

[EricLeBouffon]

Great, I'll mark the topic as [Solved], but do you mind sharing with the rest of us what was it that actually fixed it?

I had the same problem and I just disabled Hyper-V, rebooted, ran your two commands and everything went back fine straight away

Thank you so much.

[Nerferus]

Hi. This is my first post in this forum.I would really appreciate the help.
I have the windows 10 April update 2018
i have a problem with virtual box on Windows 10. When i try execute a virtual machines appears this message

Photo message

Captura1.PNG (14.83 KiB) Viewed 22540 times

I don't have installed anything services for Hyper V

[socratis]

@Nerferus
One post below yours, there was the exact same discussion, so I merged your topic with the existing one.
Please read the discussion from the beginning.

[Shah P]

My apologies for the error in the solution i posted earlier, saying EXCEPT hypervisor was meant to be Including Windows Hypervisor Platform.
Windows Hypervisor Platform is not with in the Hyper-V branches, but rather further down the list.

hypervisor.png (28.65 KiB) Viewed 22530 times

Make sure you uninstall that as well.