I've ended up having to re-install the computer from scratch after I was trying out commands from in the DOS manual and accidentally used Deltree /Y and forgot to specify a folder to delete, so it deleted everything from the root of the C drive.Thankfully the disks used to install it were in the disk boxes on the top shelf of the computer desk so I have managed to re-install MS-DOS and Windows and the games and almost everything else. Hopefully no-one else will notice anything different, and at least all our files are stored on disks so we didn't loose any of my homework or Dads work.