Thank you for the details. I don't think you are using 20 years old Windows 95, but it's sufficient to know that you are on Windows.
Adobe Reader 10.1.13 is the latest Reader X version, so that is good!
Firefox uses its own PDF viewer, not the Adobe Reader plugin, so that may be the cause for the 'This PDF document might not be displayed correctly' message.
Internet Explorer does use the Adobe Reader plugin, but you are getting a "file is damaged" message. That means that either
- the file gets damaged during the download
- the file is originally damaged and not compatible with Adobe Reader
On your browser, do you have a link that points to that PDF file? If so, you could try to download it from the link (right-click on it, then Save Target as (or) Save Link as), then open it with Adobe Reader from your saved location.
Just received another new copy of PDF from same supplier and did as you suggested again, right clicked the PDF attachment on email and saved link to desktop and then went to Adobe reader and did file open and WOW it opened. So lesson is never open this supplier's attachment with out saving link first, then going to Adobe Reader 2nd and opening through Adobe Reader file open.
Hence it is likely to be my system and if I don't follow the process you suggested above all other process's will corrupt file the moment I open it. I will look into resolving this if it ever happens again with any other PDF files sent to me, but as yet it has only been this one provider. A Big thanks for your help, cheers, Annie