Hi Dazy,
This is the common error message of Microsoft PowerPoint. You can fix this error by following ways:
1. Try Open and Repair
2. Open the file in safe mode
2. Delete COM Add-Ins
3. Insert the slides into new presentation
You can take the help of this article: https://support.microsoft.com/en-us/help/927477/how-to-troubleshoot-a-damaged-presentation-in-powerpoint-2007-and-powerpoint-2010
or you can contact to Microsoft support team and share your problem. There are lots of reason for Powerpoint file corruption like hardware and software. At last, I will suggest to you a PowerPoint repair software for repair your file.
