Microsoft Security Essentials causes lag in Word 2007

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When I am running Microsoft Security Essentials with realtime checking turned on,, I get a slight lag in performance in Word 2007.  That is, when type fast and move blocks of text rapidly, the program stops working and shows me the hourglass wait icon

for a half second or a second.  If I disable Microsoft Security Essentials the lag goes away. I have added the  Word program winword.exe to the Microsoft Security Exxentials excluded processes and I added the directory of my documents to the excluded locations, but I still get the lag.I am running Windows 7,  64-bit version.

 

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