I went ahead and disabled the sync function Add-on. The problem went away. I suspected that it was related to the google calendar sync.

My guess is that i entered a calendar event on google and it was mangled...and then when sync'ed to the Windows system it was not recognized. I will go to the web and see if i cannot delete any appointment for Jan and make this go away. It will be my goal to re-enable the sync later...its the only way that i know to sync my Android tablet calendar with the desktop. Unless someone out there knows of another way?

Thanks for telling me how to do the /safe mode start up. I was not familiar with that.

Terry