Auto correct text changes

[David Rudman]

I am editing a document in word 2007 that has been saved in compatible mode.
Whe I try to turn one heading into italics or bold it changes all the
headings in the document to the same formatiing.

Can any one help me to stop this happening. If I then press undo all the
other changes revert back and not the one I have just made. I can't keep
pressing undo everytime I make a change. I just want it to change the words
I am highlighting

 

[Stefan Blom]

See http://word.mvps.org/faqs/formatting/wholedocumentreformatted.htm.