Upgrading VirtualBox on Windows Host and Ubuntu Guest - Avoiding USB Failure

Here's a note that may save you some time when upgrading VirtualBox on a Windows Host (Vista in this case). Before running the setup file for the new version, be sure to turn off UAC so that VirtualBox installs with Administrator privileges. Failing to do that will cause you USB connection to fail. When you're finished the installation be sure to turn UAC back on.