Hi Vladok,
This can happen if you were using a 'symbols' based font,
where the characters look like text but are actually graphics
of each character (these usually show symptoms of wrapping at
the end of lines in the middle of a Word (not hypenated) and
not being something that spell check 'sees').
See if the information and the macro in this article helps
http://support.microsoft.com/default.aspx?scid=kb;en-us;290978&FR=1
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I have copied the word document to CD then back to HDD but the content of the
document completely changed. It is just squares instead of characters. What
should I do to convert them back? >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx