Forums will be making significant UX changes to address key usability improvements surrounding search, discoverability and navigation.
To learn more about these changes please visit the announcement which can be found
You will get a message saying that "Windows has installed new devices, in order for them to be fully functional you need to restart your computer." You get this message because when a backup is opened it loads a disk driver that allows you to open the backup as a separate disk. If you restart your computer you will have to start the process of opening the backup all over again. Do not restart your computer, the backup will open and you should not have any issues.