MS Word crashes when trying to close an MS Word file

delete the

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Data

registry subkey. To do this, follow these steps:

1. Exit all Office programs.
2. Click Start , type regedit in the Start Search box, and then press ENTER.
    If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
3. Locate and then click the following registry subkey:
   HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Data
4. On the Edit menu, click Delete, and then click Yes.
5. Exit Registry Editor.
6. Restart Word.