Usually a damaged registry key
http://support.microsoft.com/default.aspx?scid=kb;en-us;236872

Signature
Amazing PPT Hints, Tips and Tutorials
http://www.PPTAlchemy.co.uk
http://www.technologytrish.co.uk
email john AT technologytrish.co.uk
> When I try to save a PPT 2000 presentation an error message (I/O 0) appears
> and it is not possible either save and close the application (OS is Windows
> XP).
> I already uninstalled Office and installed it again, but I got no improve.
> How can I clear the problem ?