You administer an Active Directory domain that includes portable computers that have Windows 7 SP1 installed. You log on to one of the portable computers by using a domain user account and install a new device for a bar-code scanner. You restart the portable computer after installing the new device driver. You successfully log on to the computer by using a domain user account. After logging on, you discover that the bar-code scanner is not working due to a driver error. You try to remove the installed driver, but the Roll Back Driver option is unavailable. You need to be able to roll back the driver to its previous version. What should you do?