Cannot open some PDFs on Macbooks

Hi folks! I have Macbook (2008) and Macbook Pro (2010) and both cannot open some PDFs. I got an error message 'there was an error opening this document. the file is damaged and could not be repaired'. I tried to use Mac's Preview, Adobe's Acrobat (9 and 10, with latest updates) and Adobe's Photoshop CS5 - none did work. Both laptops have OSX 10.6.7 with all latest updates. The funny thing is that files work fine in old Adobe Acrobat 6 Pro on Windows XP though before opening it shows a message that the file was created in newer version of software and you should update yours but then it opens the file.
The problem is completely random and I cannot find any correlations with Acrobat's options/settings. Does anyone have any ideas?

Since you say that the file opens in Acrobat 6, why don't you do a Save As in that version to rewrite the file. Then it may work. (Basically, the file sounds corrupted.)

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Or http://helpx.adobe.com/acrobat/kb/pdf-browser-plugin-configuration.html

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