Why can't word20 10 be saved?

When word20 10 cannot be saved and the saving is invalid, please change the settings as follows:

Step 1, open a word20 10 document;

Step 2, click the "File" → "Options" button;

Step 3: In the dialog box that appears, click the Save option. In the Save in box, select a file format, such as word document (*. Docx), and then click the add-in option, as shown below.

Step 4, click the "com" add-in and remove the hooks in front of "Acrobat PDFMaker Office COM Addin", "Microsoft Word Manuscript Wizard Add-in" and "Microsoft Word Calligraphy Add-in";

Step 5, save the settings and close the document;

Step 6, reopen the file, edit and save it.