Sounds as if you are in Overtype mode instead of Insert mode.
Double-click the OVR button in the status bar (the bottom of the window) or
press the Insert key on the keyboard once (the OVR button in the status bar
is dimmed when you are in Insert mode).
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Regards
Lene Fredborg - Microsoft MVP (Word)
DocTools - Denmark
www.thedoctools.com
Document automation - add-ins, macros and templates for Microsoft Word