PDF help much welcome...

Well I have downloaded some .pfd files I would like to put onto my Palm to read. When I want to add it in the Adobe Acrobat reader for Palm OS, it says 'this is not a tagged PDF'. It then says it can probably try to do the conversion anyway.
Then it tries to process, but stops with 'error converting to tagged PDF: could not read page structure (bad page contents) (5)

According to the user guide the Palm Reader requires tagged PDFs and these are not tagged. Any suggestions how I could change them to become so? Somehow I cannot do 'save as' when I view the files on the PC.

I want these files on the palm so I can read in bed, I hate having to sit in front of the PC to read!

Any help?