Cause: The document was saved in Word 98 or earlier.
Solution: Save the document in a later version of Word.
On the File menu, click Save As.
On the Format pop-up menu, click a file format that is later than Word 98, for example, Word Document (.docx) or Word 97-2004 Document (.doc).
Note: Do not use Plain Text (.txt), Rich Text Format (.rtf), or Word 4.0-6.0/95 Compatible (.rtf) because these file formats cannot display nested tables.
Solution: Remove the nested table.
Click the nested table.
Rest the pointer on the until appears.
Drag the inner table to a location that is outside the enclosing table.