Ever since i started using Windows 10, i'm having major issues running virtual machines. Some web searches showed that Bitdefender is known to block vt-x and i can confirm that uninstalling bitdefender fixed my issues.
When Bitdefender is installed Virtual Box is giving me this error:
VT-x is being used by another hypervisor (VERR_VMX_IN_VMX_ROOT_MODE)
Another visualization program i tried was VMWare, which gave a more cryptic error, but failed just like Virtual Box.
Since it is possible to run both VirtualBox and VMWare at the same time, that is if bitdefender isn't installed, it should be possible to use vt-x and NOT block all other applications from using it. PLEASE DO THAT. FIX YOUR SOFTWARE. THANKS...