Log in as the user.
Quit all Windows applications.
On the Windows Start menu, click Run.
In the Open box, type regedit, and then click OK.
Locate the following key by double-clicking the appropriate folders:
HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Data
With the Data folder selected, click Rename on the Edit menu.
Type a new name for the Data folder (for example, type OldData) and then press ENTER.
On the Registry menu, click Exit to close the Registry Editor and restart Word normally.
If that doesn't solve it, see the other tips shown here:
support.microsoft.com/default.aspx?scid=KB;EN-US;Q242368