I assume that a Sandisk Cruzer is a flash drive? It seems likely that the
document is corrupt (unless you are trying to open a Word 2007 document in
Word 2003 not equipped with the compatibility pack). Always COPY files to
removeable media then COPY back to the hard drive before working on them.
You can find a macro to simplify this at http://www.gmayor.com/automatically_backup.htm
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Graham Mayor - Word MVP