As you may know, Windows 7 doesn't support USB 3.0 by default. This is also why the installation of Windows 7 from an USB 3.0 key requires a little manipulation beforehand.

• First, we need to login onto a physical Windows machine that we are planning to clone. Download the Disk2vhd.zip, once it is downloaded and unzipped, you’ll see the following files: STEP 2. The next step is to use disk2vhd.exe to create VHD Image of a physical Windows machine. Right click on disk2vhd.exe and run it as administrator.
• Hi, I also get the problem with an Intel Core i7-2600 - 3.4GHz, 4GB RAM, no PAE. Guest: windows 2008 server R2, 64bits. Host: windows 7, 32 bits. Virtualbox release number: 4.1.8 r75467 I note that the more I allocate memory to the guest, the more it waits before rebooting the host. So I guess there is a problem at the limit, when the memory.

In short, because Windows 7 supports USB 2.0 by default and not USB 3.0, VirtualBox defaults to an USB 2.0 controller when you create a virtual machine to install Windows 7.

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This is visible in the device manager in your virtual machine running Windows 7.

To use an USB 3.0 controller in a VirtualBox virtual machine under Windows 7, you must first go to the USB section of your virtual machine's settings.
Then, select : Controller 3.0 (xHCI).

In the Windows 7 guest operating system, you will see that Windows couldn't automatically install the driver for the used USB bus controller since it doesn't support it by default.

In the device manager, this 'Universal Serial Bus (USB) Controller' will appear with a yellow icon as there is no driver for this device.

To solve this problem, you had to download and install the 'USB 3.0 Driver: Intel® USB 3.0 eXtensible Host Controller Driver for Intel® 7 Series/C216 Chipset Family' provided by Intel.
Nevertheless, as was stated on the official website of Intel, this 'product' was at the end of life.
And today, this page and this driver are no longer available from their official website.

Fortunately, the 'Archive.org' site had saved these pages, as well as the associated driver.
So, you can download this official 'Intel USB 3.0 eXtensible' driver via the archive.org cache.

Once installed, Windows 7 will recognize this new USB 3.0 controller.

And you will find 2 new devices in the device manager :

32-bit Ram

• Intel(R) USB 3.0-Root-Hub
• Intel(R) USB 3.0 eXtensible-Hostcontroller