That depends on the specific situation. If all the mathematical symbols in the word document in the library become question marks because the formula editor is not installed, reinstallation is also possible. If not, there will still be problems after installation, or your own formula editor may not load well. It is suggested to reload each MathType, which should solve the problem. The loading method is as follows:

Step 1 Clean uninstall the installed mathtype.

Step 2: Find the installation directory C: \ program files \ Microsoft Office \ Office12 of the word document, and manually add a startup folder.

Step 3 Reinstall the mathtype application. The load file of MathType Commands 6 For Word will appear in the startup folder.

If the question mark is still displayed after loading, you can double-click the formula with MathType to open it, then save the formula again, save the formula as a file in Options, and then format the formula, which can generally be solved. I suggest you go to MathType official website and search for related problems. There should be corresponding solutions.