The error is caused by your Office Suite and registry problems. The best way to cure is to use system restore from a period a few days before the problem System Restore - How to
If that does not work, download ccleaner and untick all registry items. Analyse all registry problems and tick the ones that have to do with MS office suite, then run ccleaner.
If that does not work, you can unistall Office Suite and replace with the free open office.
Before making any changes create a system restor point so you can go back. http://www.openoffice.org/