I have Adobe Reader on my Vista OS. When I try to open a PDF file, I either get a message that states I must exit Adobe and when I click "OK," the file opens. However, on occasion, I'll get the following error message in which I cannot open the file and a blank Adobe window opens:

"file is damaged or cannot be repaired."

 

Next time you can successfully open the file, Save As a new file name. If there is any corruption, saving it as a new file may fix the problem.

 

you have updated to the current acrobat reader?

 

Hello,

You can also try an other PDF reader, like foxit reader:
https://www.foxitsoftware.com/
https://www.foxitsoftware.com/products/pdf-reader/

Bertus