Perhaps I posted I am posting in a wrong thread.
Anyway, I sent some paperwork to the local computer place to have it scanned and sent back.
He insisted on pdf files, he sent them, I put them in a folder except for one I forgot about.
I found it in the downloads as a pdf file but when I went to put it on my desktop, I received an expired message.
All the pdf files on my desktop were fine.
It seems only when they were left in the Adobe Acrobat Reader they expired.