Help - "Acrobat is being used by another application and cannot open PDF files until the other application is closed."

Hello,
I searched this site and google for this error terminology and come up dry.  I support a user who has been for years using Acrobat 5 (yes, I know...) to read files in a client DB program, as well as other PDF files on their PC.  In the last week or so, they have started gatting this error "Acrobat is being used by another application and cannot open PDF files until the other application is closed." any time they attempt to open a PDF file attached to an email (via Outlook).
It is my understanding that they cannot upgrade to a newer version of Acrobat because of limitations of their client software, but had not previously had any issues viewing PDF notes from the DB, and PDF attachments in their email.
I have tried uninstalling and re-installing, as well as tried using Adobe Reader 7 & 9 in conjunction with Acrobat to try to get around this issue, but have not been successful.
Any ideas?
Thanks,
Jesse

I don't have an answer to your technical problem. The product I assume is Acrobat that you are talking about (based on the post title), Adobe is the company name. This is a good place to ask questions on Acrobat if folks can figure out what you are talking about. They will ask for the product version number (like AA9.3.3), operating system, and other applications if appropriate. Also, just what you are doing that generates the message.
As for Adobe, you are not likely to get an answer from them here in the user forum. You will be lucky if you can get an answer if you can contact them and not be on hold for more than an hour (sorry, this is why a lot of folks end up in the forum).
So, to help others try to answer your question, what are the products and versions involved? What OS? What are you doing when the message comes up.

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