Windows 7 Word 2007 Problems

Microsoft Word 2007 has worked fine for me until just a few days ago, when it started crashing when I tried to do anything on it. Uninstalling any 3rd party add ons seems to kinda fix this problem, because without the one I had, Word now only crashes when you try to exit the program. The problem is, I need the add on for my schooling, because I take classes online, and the add on is called MathType, a program for writing out equations and such in Word. When I try to use the add on, it comes up with a really long error, I might post it later. I have had no problems with any other Office 2007 program, and I never had any problems with Word before this; I installed it a few months back. Also, I have tried reinstalling, but this doesn't seem to fix the problem. I've also tried running the Office Diagnostic tool and I know that it encountered a problem, but it would just say that the problem was fixed, and it wouldn't tell me anything about the problem.