OK the first thing we should try is a repair of the Microsoft Office suite. Please do the following:
How interesting. OK in that case the best thing to do here is probably a system restore to the day before yesterday, since the problem just started occurring. Please try these instructions and let me know if they do not solve the problem. You can get back to me after the reboot by going to http://www.justanswer.com/ and clicking on My Stuff -> My Questions, then clicking the link for this question.