Well, PowerPoint is a great tool for creating, editing, opening presentations, but sometimes when you try to open a presentation in PowerPoint 2002, in PowerPoint 2003, or in PowerPoint 2007, you may receive an error message.
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In Microsoft PowerPoint 2002 and PowerPoint 2003 Error Message
PowerPoint can’t read path\file_name.ppt.
In Microsoft PowerPoint 2007 Error Message
Error Message 1
PowerPoint found unreadable content in Presentation.pptx. Do you want to recover the contects of this presentation? If you trust the source of this presentation, click Yes.
Error Message 2
There was an error accessing C:\documents and settings\username\Presentation.pptx
You need to determine the error number of that message.
for that, you need to press CTRL+SHIFT+I.
These numbers will be appeared :
400645 for error 1
400066 for error 2