I just installed VirtualBox on my pc, this is my config:

i7 skylake
8gb ram
hard disk 1tb
ssd 200gb
vga gtx 970
os windows 10

I'm trying to perform the installation of windows 7 but when I start the virtual machine I get this error:

enter image description here

Opening of a session for the virtual machine win7 failed

Now I've the Hyper-V enable in my pc and also the VT-X and intel virtualization technology is enable in the bios.

This is the log:


  • Did you reboot the machine after installing? – djsmiley2kStaysInside Mar 20 '17 at 14:19
  • yes, several times – AgainMe Mar 20 '17 at 14:57

Could be unrelated, but you mentioned you have hyper-v installed. I found virtual box wouldn't work for me unless I disabled hyper-v on boot. I'm not sure if it's the same issue as it happened a while ago, but you could temporarily disable hyper-v to test it using the command from here,

To add an option to disable it on boot I used this method, whose relevant commands are:

C:\>bcdedit /copy {current} /d "No Hyper-V" 
The entry was successfully copied to {<some uuid>}. 

C:\>bcdedit /set {<some uuid>} hypervisorlaunchtype off 
The operation completed successfully.
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