Unexpected error code - 10660

[Christine_Marciniak@adobeforums.com]

Whenever I double-click a PDF file, I get this error "an unexpected error occurred (error code -10660)."

I've read the FAQ post but the fix doesn't apply to me. What's happening is that when I double click a PDF file, my old version of Acrobat opens. When I trashed the old version of Acrobat, no file will open at all and that's when i get the above error. I can launch my new version of Acrobat (7) and then double click a file and it will open but the new version has to be already open or I get the error. Is there some other fix for me?
Thanks!
Christine

[Christine_Marciniak@adobeforums.com]

Update:
I've noticed that any PDFs I created with my newer version of Acrobat don't have this problem. They will launch the program by double clicking the file just fine. It's all my other PDFs created with the older version of Acrobat that do this. Some of my PDFs were created in Mac OSX using the "create PDF" button in the print dialogue box if that helps.