You receive a dialog box asking for a user name and password when navigating away from a word document
If you open up a Microsoft Word 2007 or 2003 document from a website, and then navigate away from the document (back button, click a link, different website, or close the browser); You get prompted to login.
Cause of the Problem:
Microsoft Word is attempting to write the document to it's "Most Recently Used" files list. In it's attempt to do this Microsoft word tests it's ability to read AND write back to the document. When anonymous write permission fails it then prompts you for the user name and password.
To resolve this problem, you must add the DontAddToMRUIfURL registry value. To do this, follow these steps:
Click Start, and then click Run.
In the Run dialog box, type regedit, and then click OK.
In Registry Editor, locate the appropriate registry subkey:
Word 2007 HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Options
Word 2003 HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Word\Options
Click Options, on the Edit menu, point to New, and then click DWORD Value.
Type DontAddToMRUIfURL, and then press ENTER.
Click DontAddToMRUIfURL, on the Edit menu, click Modify.