PowerPoint 2003 error when you try to open a presentation file

For some time now, some users with Microsoft Office 2003 installed (not all, but their number is increasing every day) began to complain that when you try to open almost any file-presentation get the following error text:

"PowerPoint was unable to show part of the text, some images, or objects on the slide, "filename.ppt" because they are damaged. The damaged presentation slides were replaced with blank ones, and the lost information cannot be recovered. To open this file in previous versions of PowerPoint, save the file under the same or a different Name."

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