Some how, one of the columns from the table must have been deleted or the
table became corrupt.
Instead of using the Data Form window, you can just create a 3 column table
in a Word document and enter the field names in the first row and the data
for each record on a separate row. Or, enter the data into and Excel
spreadsheet that has the field names in the first row.
See the article "Creating a Mail Merge Data Source" at:
http://word.mvps.org/FAQs/MailMerge/CreateADataSource.htm

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Hope this helps,
Doug Robbins - Word MVP
> In Word 2000, created a 3 field table for address labels,
> began entering data in the Data Form window. After several
[quoted text clipped - 3 lines]
> error message that table was corrupted. What caused this,
> how can I recover from it, and prevent it in the future?