Hi choco_chic,
You've got Word working in overtype mode. You can toggle this on/off by pressing the <Insert> key.
Cheers

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macropod
[MVP - Microsoft Word]
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> when i make a mistake in my text and go back to change it e.g put other
> words, it deletes following characters. how can i make it so it works
> normally, it hasn't always done this?