Suddenly getting "Failed to load VMMR0.r0 (VERR_LDR_MISMATCH_NATIVE)"

Question

Failed to load VMMR0.r0 (VERR_LDR_MISMATCH_NATIVE)

My VMs on Virtualbox 4.2 (on Windows 7 32-bit) were running absolutely fine until I started installing a new VM, which would not go beyond the Linux boot screen.

I deleted the VM and created new one, but it still didn't run.

So I installed the new version of VirtualBox (version 4.3.6.r91406) and rebooted the machine; but when I started any of my previously working VMs, I got the following error

Failed to open a session for the virtual machine m14
Failed to load VMMR0.r0
(VERR_LDR_MISMATCH_NATIVE

with the following details:

Result Code: E_FAIL (0x80004005)
Component: Console
Interface: IConsole
{8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

On checking the forums, I saw few posts asking to check the .vbox files. In the directory of the VM, there are two, m14.vbox and m14.vbox-prev.

I removed the prev file and restarted the VM, again got same error, and the m14.vbox-prev file came again. So I then removed the original m14.vbox file and renamed the prev file to original and then started the VM: it still didn't work.

Any clues fixing this?

Answer 1

Hi I had the same problem in version 4.3 I disabled the floppy and the CD into the system configuration of the virtual machine and then the machine has started properly without realizing the error.

Answer 2

Add or update the extension pack.

If that doesn't solves the problem, then uninstall the Virtual Box, delete the following folder:

C:\USERS\<username>\AppData\Local\VirtualStore\Program Files\Oracle

then install Virtual Box again and run it as administrator. (In some cases running it as simple user may work too.)