The problem could be due to automatic updates for your computer which may have disabled the Cite while you write add-in in Word.
Try the following:
First check to see if Word has listed the add-in as disabled:
Click the "Help menu" and select "About Microsoft Office Word."

Click "Disabled Items."

Highlight any EndNote item(s) and click "Enable."
Click Close.
Click OK.
Click the Office button in the top left corner of the Word 2007 window.
From the bottom of this dialog choose Word Options.

Click on the Add-Ins tab.
From the Manage drop-down menu select Disabled Items then select Go.

Highlight any EndNote item(s) and click "Enable."
Click Close.
Click OK.
If prompted, select to allow the file(s) to be loaded by Word. Close and re-open Word when this is done and check the operation of the toolbar.
If you are still getting the error try:
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