by mistake I replace a document with a blank document in word. I had saved
the previous document.
Microsoft's Help system has landed you in the wrong newsgroup: this
one is for the database program Microsoft Access.
Please use the dropdown box (the one that says "Access" by default)
to select a more appropriate newsgroup, microsoft.public.word for
example.
However, I strongly suspect that your document is gone forever. You
were asked if you wanted to overwrite the existing document; you said
yes; it obeyed your instructions.
John W. Vinson[MVP]