virtualbox crashing

[cm123]

I opened virtualbox and my virtual machine became inaccessible. I get an error message when I open VirtualBox and click on the Ubuntu guest machine. When I click the Ubuntu VM, it crashes VirtualBox. How do I resolve this? I tried uninstalling virtual machine so I can reinstall Ubuntu on it, but it was still there. How do I resolve this?

[multiOS]

Don't think anyone can even start to help without knowing precisely what the error message was that you received.

You should also submit a copy of the 'VBox.log' file from the VM Folder. 'zip' the file and upload it using the message upload attachment tab.