This may help.
"An unexpected error occurred - I/O Error 0" or "An unexpected error occurred -
I/O Error 6"
http://www.rdpslides.com/pptfaq/FAQ00375.htm
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Michael Koerner [MS PPT MVP]
I'm having the same problem, and am getting frustrated at trying to get an
answer.
nn said:
Help!!! Everytime I try to open a power point presentation, a pop up window
stating "an unexpected error occured. I/O error 6. Then it shuts down my
power point. Can anyone help?
thx,
NN