I downloaded a Windows 7 iso, created the VM for it, and it won't open. I get the following error box:

Failed to open a session for the virtual machine VeenDoze.

The virtual machine 'VeenDoze' has terminated unexpectedly during startup with exit code 1 (0x1).

Result Code: NS\_ERROR\_FAILURE (0x80004005)
Component: MachineWrap
Interface: IMachine {f30138d4-e5ea-4b3a-8858-a059de4c93fd}

And if that weren't annoying enough, I can't get rid of Virtual Box. I've tried uninstalling through terminal and software center and it won't go away.

Running Ubuntu 15.04 Unity