100% working solution: Virtualbox 'amd-v is not available error'

Finally we found the solution for the AMD-V is not available error in the VirtualBox environment. We started to have this error without any direct reasons, so we started to search for what has happened. We tried uninstall, reinstall, repair and other versions of the VirtualBox application, but it did not fix anything. Now the solution to the AMD-V is not available error is very simple if you do not depend on the Hyper-V manager.