Create a new blank presentation in PowerPoint, and save it under a new name.
Then, go to Format -> Slide Design, choose to show all documents, and choose
the corrupt PowerPoint file. Now, go to Insert -> Slides from File, and
select the corrupt PowerPoint file. Make sure you are set to insert all
slides, and then import. If that works, great! I suspect, however, that
you might crash at that point. If so, try repeating the process, inserting
specific slides one by one until you find the problem one. After that, save
the file, making sure that Fast Saves are off (in Preferences / Save).
See this web page for more advice:
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http://www.rdpslides.com/pptfaq/FAQ00423.htm>
