Trouble Viewing PDFs on iMac using OS 10.7.5

I am having trouble reading or viewing certain PDFs, primarily from various web sites, on my Intel Core 2 Duo iMac using OS 10.7.5.  I have the latest version of Adobe Reader but certain PDFs are scrambled.  The sources for the PDFs are very random.  Can anyone help?

Will the PDF files open in another PDF reader on your iMac, such as Preview? You can find preview in the Applications folder in Finder if you haven't used it.
I would also double-check that you're not mistakenly using preview instead of Adobe Reader

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