My OS is full, tired & slow - definately time for a rebuild. I've prepared - backup of drivers done, data all backed up ... . Then I put the disk into the drive - but message from Microsoft is: "Later system already installed." (It's not of course, just has updates) So I can't install afresh as when I turn on with disk in place it still boots from HD and not from disk.
Everyone has to rebuild regularly so I'm sure there's answers to my problem already so: