virtualbox.org

My VirtualBox sometimes gets stuck and so i close it but it does not shutdown entirely in fact the process stays there even if I terminate it, does not go away. The process stays stuck there and when I try to erase the virtual machine from the disk it states that it is being used by a process that is in fact the VirtualBox.exe process.
Thank you Titanicoso

Additional Data: Guest system Windows 7 Home Premium x64.