HT1338 I cannot open any pdf files on my mac book air.  I used to be able to.  I downloaded osx mountain lion and it still doesn't work.  any suggestions?

I cannot open any pdf files on my mac book air.  I used to be able to open them.  It was suggested that I get OS Mountain Lion and I did.  still can't.  Any ideas? 

You can download Adobe Reader from adobe.com.  The Mac OSX uses its "reader" to open PDF files without the Adobe Reader.  If you downloader adobe reader, it should open all PDF files.  Hope this helps.

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