Failed to load VMMR0.r0 (VERR_LDR_MISMATCH_NATIVE)

[G85]

My VMs on Virtualbox 4.2 (On Windows 7, 32 bit) were running absolutely fine until I started installing a new VM. That one would not go beyond the linux boot scree.
I deleted the VM, created new one, but it still didn't run.

So I installed the new version of Virtualbox (version 4.3.6.r91406), rebooted the machine, and then when I started any of my previously working fine VMs, I got the following error:

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

In details I have the following lines:

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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 2, one by the name m14.vbox and another 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.

Can any one tell me how do I fix this issue?

[Perryg]

Did you also update the extension pack?

[G85]

Yes, I did that. And still same results.

[Perryg]

Remove the Oracle folder

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

The install again by right clicking the install and select to run as administrator.

[G85]

Amazing! This worked! Thanks a million!

But can you please also tell what exactly was the problem and how did deleting that directory helped?
I am really very curious to know this.

Thanks in Advance.

[Perryg]

Usually installing as normal user and not as admin. Once corrupt the only way to fix is stated above.

[G85]

OK. But any clues what caused the corruption?
Cause everything was working fine and I was working with an administrator account already, so it was definitely corruption.

On another note, just for others who may come here looking for a similar problem in LInux, the same thing is to be done in Linux too:
https://www.virtualbox.org/ticket/12258

1) sudo rm -rf /Library/Extensions/VBox*
2) re-install VirtualBox 4.3

Once again, thanks a lot.

[Perryg]

Slight correction.
Mac OS X in not Linux.

[lior007]

HAVE SAME PROBLEM IN WIN 8.1
WHERE IS Oracle folder LOCATION IN WINDOWS 8.1?
THANKS