The VirtualBox kernel driver is not accessible to the current user. Make sure that the user has write permissions for /dev/vboxdrv by adding them to the vboxusers groups. You will need to logout for the change to take effect..
VBox status code: -1909 (VERR_VM_DRIVER_NOT_ACCESSIBLE).


Result Code: 
0x80004005
Component: 
Console
Interface: 
IConsole {1dea5c4b-0753-4193-b909-22330f64ec45}

 
I also get this when i want to configure the xp virtual machine as root:


Could not load the Host USB Proxy Service (VERR_FILE_NOT_FOUND). The service might be not installed on the host computer.


Result Code: 
0x80004005
Component: 
Host
Interface: 
IHost {81729c26-1aec-46f5-b7c0-cc7364738fdb}
Callee: 
IMachine {31f7169f-14da-4c55-8cb6-a3665186e35e}