In Windows Vista, when you remove a USB host controller or a device that contains a USB host controller, Windows Vista crashes. Additionally, you receive a Stop error message on a blue screen. This problem occurs if the following conditions are true:

• A USB device is connected to the USB host controller.
• The USB device that is connected to the USB host controller is transferring data.

After you receive the Stop error on a blue screen, you also encounter one of the following problems:

• If the USB host controller is connected again, the USB host controller does not appear in Device Manager. Additionally, the USB host controller and any attached USB devices do not work.
• If you try to close Windows Vista, a black screen appears, and you have to manually turn off the computer.