I uploaded Adobe 10, I have an old laptop with a Vista operating system. The documents are opening as a fdf, not a pdf, and every time I try to open them, another copy appears on the bottom of my screen, but it will not open.
Do you mean when you download a PDF its file type is changed to an FDF file or are you downloading a return from a completed form?
If the latter, import the FDF data into a copy of the submitted form.