I am using the latest Acrobat reader. I have reinstalled it numerous times, and tried opening these documents on another computer using Adobe acrobat 9 Pro. I am using Windows 7 Ultimate 64 bits. In the end I had to download Foxit, which reads the documents without a proble. I would like to get back to using Acrobat. I can send the file (it contains personal information) to Adobe if they are interested.