Oracle virtual box inaccessible

Question

I am using Oracle Virtual Box version 4.2.16 r86992. Everything was fine until yesterday shutdown. Today, it shows inaccessible and throws this error:

Runtim         


        

Answer 1

On a Windows 7 Host, I found that Daemon Tools service had a hold on the file.

The solution was to uninstall Daemon Tools, but I suspect if you stop the service and remove the file association, you would be sorted.

Answer 2

Based on my experience, I was on Windows 7 and running Ubuntu 14.04 as guest OS on Virtual Machine.

1. Go to your Virtualbox folder (in my case): C:\Users\Dev12\VirtualBox VMs\Ubuntu
2. You'll see files with extensions: Ubuntu.vbox-tmp or Ubuntu.vbox-prev
3. Remove -tmp from file name Ubuntu.vbox-tmp so that it reads as Ubuntu.vbox
4. Exit from Virtual Machine and start it again.
5. You should now see error gone away.

Answer 3

The other issue might be that if your Virtual Machine was on an external hard drive, it is possible that the drive letter has changed. If so, go to Computer Management, and select the hard drive and right click to change the drive letter and save (Note that this is for Windows).