FabianBachmeier opened this issue on Sep 08, 2015 ยท 2 posts
3dstories posted Fri, 11 September 2015 at 4:19 AM
My dad had a similar problem occur and in his case it seemed to be a conflict with the Avast antivirus. There is a known bug with Avast that occasionally resurfaces and prevents office products from saving correctly. Your solution may not be to reinstall office, but rather to first disable Avast, if you have it on your machine, to see if it makes a difference.
I found this thread for you (Note that it continues from 2012 at least through March of 2015 and includes issues with ppt):