OS: Windows 7 x64
VirtualBox: 4.3.14 & 4.3.15
Motherboard: Gigabyte GA-H77M-D3H
I receive the error below when I try to run a virtual machine with Enable VT-x/AMD-V on. With this setting off the virtual machine runs successfully.
Failed to open a session for the virtual machine MachineName VT-x is being used by another hypervisor. (VERR_VMX_IN_VMX_ROOT_MODE). Virtualbox can't operate in vmx root mode. Please close all other virtualization programs. (VERR_VMX_IN_VMX_ROOT_MODE).
I have the virtulization settings set to on in BIOS.
I tried updating BIOS, it didn't fix the problem.
When my BIOS was updated virtulization was off by default, and going into VirtualBox the Enable VT-x/AMD-V option wasn't there, I turned virtulization back on and the option was back - so VirtualBox appears to correctly know when my virtulization is on.
I tried updating VirtualBox from 4.3.14 to 4.3.15 as apparently it fixes some problems with anti-virus programs intefering with VirtualBox, so I updated to rule that out, still the same problem.
I have no other virtulisation software installed as far as I know.
As far as I know I don't have any programs running in compatibility mode.
Any ideas what else could be causing this error? Or is there any way to find out what else is using VT-x?