Weird problem: Control Panel -> Backup and Restore will not open the Backup tool, nor will any shortcut from the Start menu or Control Panel
It happens under all users, including newly created ones and Administrators
From the Action Center though, I can start a new backup running but cannot view its progress because the Backup tool does not open.
When I try to launch the Backup tool, there are no entries in the Event Log. Backups set to run from the Action Center do complete, and right clicking any backed up files do show the "Previous versions" OK.