Word adds symbols (squares) in my text

[Trip]

Hi, I have some problem with my word2000. It adds symbols, mostly squares to
my text. It can be if I save a document and close it, when I open the doc
again the text is filled with squares and other symbols. And there can be one
or several blank pages in the middle of the document filled with maybe 2-3
rows of squares and som other symbols, almost looks like wingdings, but the
font is the correct one.

Please help.

Kind regards