Cannot Open Help files

My PS CC does not open the help file.

Hi,
Can you please let me know the following:
1) Adobe Reader or Acrobat version.
2) Dropbox version.
3) Are you able to open these files from dropbox desktop client or from the web?
4) How have you placed these files in your dropbox folder? (Manually cpying the file to dropbox folder in your desktop OR upload the file to dropbox in the cloud and then file got synced automatically to dropbox in the desktop)
Thanks,
Shakti K

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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).
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Cannot Open Help files

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