PDF's from the Web

I am having trouble opening some PDF's on the web...
My computer has Windows Vista with Acrobat 5 & Adobe Reader 9 installed. Adobe Reader is set as the default program to open PDF's.
The following link opens successfully in Adobe Reader http://earth.google.com/userguide/v4/google_earth_user_guide.pdf
But I cannot open these files
http://manuals.info.apple.com/en/iphone_user_guide.pdf
http://era.nih.gov/Docs/eSNAP_UG_August2003.pdf
The following error message appears: "The Adobe Acrobat/Reader that is running cannot be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit & try again."
It then opens a blank Acrobat window. This message perplexes me since I do have Reader version 9 installed.
Why does this happen & what can I do to fix it?
Lynn

There is the possibility that Acrobat 5 is running in the background and is what the browser is using to open the files. It may have an issue with the second two files.
Try going to task manager and shutting down Acrobat (if it is open), start up Reader, then try and open one of the problem files (be sure that it is indeed Reader that is open).
It's generally not recommended nor supported to have both Reader and Acrobat on the same machine. This sounds like one of the symptoms of having both.

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