Unexpected error about USB 2.0

It’s really strange (again). I had successfully started the guest OS, and shut down at least 2 times (because I remember installing the new version addition). Last I saved the state and now I tried to resume it, I got this error:

Failed to open a session for the virtual machine Windows 7. Implementation of the USB 2.0 controller not found! Because the USB 2.0 controller state is part of the saved VM state, the VM cannot be started. To fix this problem, either install the ‘Oracle VM VirtualBox Extension Pack’ or disable USB 2.0 support in the VM settings (VERR_NOT_FOUND). Unknown error creating VM (VERR_NOT_FOUND).

What’s the meaning of it? I had already several times of startup/shutdown, yet it complains about USB 2.0 support if I save it.

Recently when I opened a saved Windows 7 virtual machine in VirtualBox 4.0.2 after the update, it showed a message about ‘ Oracle VM VirtualBox Extension Pack’ for better USB2.0 support. Its because of updated 4.0.2 version and features. The warning message did not give proper  information of downloading and installing  this package. This small guide shows how to download and install Oracle VM VirtualBox Extension Pack in Windows host machine.  Here is the message,

Implementation of the USB 2.0 controller not found!
The device will be disabled. You can ignore this warning but there will be no USB 2.0 support in your VM. To fix this issue, either install the ‘Oracle VM VirtualBox Extension Pack’ or disable USB 2.0 support in the VM settings

Its always better to have a guest operating system inside desktop virtualization software with USB 2.0 support for faster data transfer.

Installation Oracle VM VirtualBox Extension Pack can be done in Two ways.

download link :


1) You can execute the downloaded file directly from Windows explorer. It will open the VirtualBox program and ask the question as below.


Press Install to start the installation.

See Also,

What’s new in Oracle VirtualBox 4

2) The other way is, go to File –> Preferences in menu bar and select Extensions option in VirtualBox console.


Press Add Extension button as shown in above screen and browse the downloaded VM VirtualBox Extension Pack. That’s it.

You can view the installed extension packages in same place.

Uninstall a virtualbox extension package can be done here by selecting the pack and click remove button.


This installation will fix the warning message of USB 2.0 support in Oracle VirtualBox 4.0.2.

Let me know if this is useful.


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