What version of Word is he using?
If you to to the "Tools" "Options" then "save" - change the time to every 5 to 10 minutes and be sure to set your "file locations" where your dad can find the files again and they'll automatically save his work every five or whatever minutes you set it to.
When he opens up Word again, it should bring up a "recovered" document that has the most recent changes in it. Open that up, rename it to whatever he wants then off he goes.
Most important thing to teach older people when using stuff like Word - FIRST THING YOU DO WHEN YOU START TYPING IS SAVE THE DOCUMENT!!!! Give it a name and save it so you can get it back if something happens.
Hope this helps
