If you got this problem, it may come from an addin of MS Word 2010. Below is the way to help you find out which addin causes this problem.
1. Open MS Word in Safe Mode: hold Ctrl key >> click MS Word icon >> choose Yes in a dialog displayed
2. Click File menu >> Addins >> click Go button in the Manage: Com-in Add
3. Clear the checkboxes to disable all addins
4. Close MS Word
5. Try to open your document again. If MS Word can open the doc, it means an addin caused this crash.
6. Open MS Word in Safe Mode again
7. Enable one by one addin and open the doc to check when it's crashed ==> the bad guy -:)