Open virtual machine

[Euservice]

I can not open the virtual machine after a team off and I get this error:Fallo al abrir una sesión para la máquina virtual Vista.

The virtual machine 'Vista' has terminated unexpectedly during startup with exit code 1 (0x1). More details may be available in 'C:\Users\Euclides\VirtualBox VMs\Vista\Logs\VBoxStartup.log'.

Código Resultado: E_FAIL (0x80004005)
Componente: Machine
Interfaz: IMachine {480cf695-2d8d-4256-9c7c-cce4184fa048}

[mpack]

What VirtualBox version, on what host OS? If this is 4.3.14 or 4.3.16 on Windows hosts then you can either revert to 4.3.12, or try the 4.3.17 test build made available here.