How to Solve “Unkown error” Caused by Endnote in Word 2007

Today, my word 2007 doesn’t work suddenly. I would get a “An unknown error occurred” message with title “Endnote X2” (shown below) when I tried to open or edit any word files.

Endnote X2 unknown error

This drove me crazy, I uninstalled and reinstalled word 2007 several times, still nothing new happened. Finally, I got the answer.  Here’s solution from Microsoft Help and Support website.

Original website link: http://support.microsoft.com/kb/921541

Delete the Word Data registry key

Most of the frequently used options in Word are stored in the Word Data registry key. A common troubleshooting step is to delete the Word Data registry key. The next time that you start Word, Word rebuilds the Word Data registry key by using the default settings.

To view these options in Word 2002 or Word 2003, click Options on the Tools menu.

To view these options in Word 2007, click the Microsoft Office Button, and then click Word Options.

Note When you delete the Word Data registry key, Word resets several options to their default settings. One such option is the “most recently used file” list on the File menu. Additionally, Word resets many settings that you customize in the Options dialog box.

To delete the Word Data registry key, follow these steps:

1. Exit all Office programs.
2. Click Start, click Run, type regedit, and then click OK.
3. Locate the following registry subkey, as appropriate for the version of Word that you are running:
   • Word 2002:
     HKEY_CURRENT_USER\Software\Microsoft \Office\10.0\Word\Data
   • Word 2003:
     HKEY_CURRENT_USER\Software\Microsoft\ Office\11.0\Word\Data
   • Word 2007:
     HKEY_CURRENT_USER\Software\Microsoft\ Office\12.0\Word\Data
4. Click Data, and then click Export on the File menu.
5. Name the file Wddata.reg, and then save the file to the desktop.
6. Click Delete on the Edit menu, and then click Yes.
7. Exit Registry Editor.
8. Start Word.

If Word starts and works correctly, you have resolved the problem. The problem was a damaged Word Data registry key. You may have to change several settings to restore your favorite options in Word.

If the problem is not resolved, restore the original Word Data registry key. Then, see the “Delete the Word Options registry key” topic.

To restore the original Word Data registry key, follow these steps:

1. Exit all Office programs.
2. Double-click the Wddata.reg icon on the desktop.
3. Click Yes, and then click OK.

Original Journey©2009