Why can't I open pdf documents after using Adobe Reader security?

I have been able to open pdfs perfectly well up until I changed the security settings on Adobe Reader.  As I read somewhere that Apples have an inbuilt pdf reader I trashed everything Adobe, but still can't open pdfs.  Tried using Preview  to no avail. 
Is there some other way of opening pdfs without reinstalling Adobe?

You didn't think of mentioning that in your first post?  So it's not Adobe Reader or Preview you are having problems with.  It's pdf's in your browser!
For Safari, you need to remove the adobe pdf plugins which Adobe apparently screwed up.  You need to remove:
/Library/Internet Plug-Ins/AdobePDFViewer.plugin
/Library/Internet Plug-Ins/AdobePDFViewerNPAPI.plugin
I think you can "get away with" removing just the second one.  But both for sure should allow you to open pdf's in a browser (all browsers).

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