Well, you could have got some useful help here if you had been able to explain clearly what your problem is. In any case, I'll try to give you an idea of what PDFs and Reader are, which could be useful for you to know, should you ever come back and read this.
PDF (Portable Document Format) files are cross-platform self-contained documents. They retain all the formating characteristics of the original, including images and fonts, regardless of the kind of computer and printer one uses to see or print them. PDF files are also considerably smaller than the original files from which they are made.
The unique and highly compact page description format used to create PDF files makes them difficult to modify. They are also difficult to change back to other non-compressed conventional formats.
And the free Adobe Reader is a program designed exclusively for reading (opening) PDF files, although it can do some (very few) other things with them.
Knowing these basic things should help you to understand what you can expect and what you cannot expect of PDF files and of Adobe Reader. Here is a link to a Wikipedia article that you may find helpful should you wish to know more about this:
http://en.wikipedia.org/wiki/Portable_Document_Format
