Can the program Windows 7 Backup be restored to its default state? I've been trying to restore the Windows 7 backup to a default state just like you get when you first run Windows so that there are no previous version of files that are located in backups. Its down to deleteing a backup on a external drive that I had which was just the Users directory in the C drive. Now I have files in Users that have a previous version which is located in the deleted backup file. When I run Windows backup now it fails when creating a shadow copy and exits with a unknown file error. I guess it may be down to either the missing backup and the mediaID.bin file or to traces of the backup in the registry. I have tried one registry trick that restores backup to a default state but this does not remove the references to the deleted backup so the quesion to ask here is where are these references located? Is it in the registry or in a file some where in the system directory? ls this a possible defect in Windows backup?