If this only happens in one particular document, then in Word 2003 try
clicking on Tools | Unprotect Document, or in Word 2007 click on Review
| Protect Document | uncheck the "Allow only this type of editing in the
document" box.
If all new and existing documents are locked, then maybe you have a
trial version of Office 2003 or 2007, and the trial period has ended.
Or maybe you have not activated your Office software. What happens if
you start Word 2003 and click on Help | Activate Product, or if you
start Word 2007 and click on Office Button | Word Options | Resources |
Activate? If you are already activated, a dialog box saying so will
appear. If you are not activated, the Activation Wizard will start. If
you have an expired trial version, a dialog box will prompt you to enter
a valid product key or convert (purchase a key) online.