Adobe reader error opening pdf

hi there,
i'm getting the following error message when opening pdf documents stored on the hard-drive of my laptop, using Adobe Reader XI on Windows 8 operating system:
Adobe Reader could not open "xyz.pdf" because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded)
The documents weren't received as email attachments.
I've tried reinstalling Adobe Reader XI, and i've tried installing Adobe Reader X, and in both cases the problem has persisted. I am able to open certain pdf documents, but the majority return this message. I've tried Foxit and Google reader, but both fail to open these pdf documents. I've tried a pdf-fixer program, and it reports that it fails to fix the pdf documents.
Any suggestions would be appreciated!
thanks, Fergus

hi Test Screen Name, i appreciate you taking the time to help!
i've checked several documents that i understood were PDF by opening them in Notepad, and they are starting with a variety of characters in addition to the example i gave above - some examples:
1st - ;^" ¼# Ú ³ÄaªÉ@—·
2nd - —¤DÙ3îRò8ëñæ¿ ÕOÝ
3rd - wOsrL (and 2 further documents that started with these characters)
4th - 佋첩耺컜⺩垌荦ŵ嵎
i was able to read the documents when i originally downloaded them or exported them, but i didn't access them again at that time, and i have not tried to access these documents in more than 2 months. During that time i had a problem (possibly a virus) on the computer - i resolved it be reloading windows.
any suggestions would be great!

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