Does Adobe Acrobat 8 Professional support image which has been converted to a PDF to be edited?

Question

Hi,
Does Adobe Acrobat 8 Professional support the content of an image which has been converted to a PDF file to be edited?
Sometimes when I try to edit the content of a PDF file which was created by converting an image into a PDF file, I notice that Adobe Acrobat 8 Professional tells me that this Adobe Acrobat 8 Professional cannot support this content.
On the other hand, even if Adobe Acrobat professional could edit a PDF file, I notice that there are far too many restrictions to edit the content, for example, if your new editing words are more than the old then the line goes out the page instead of going to a new line. In addition, if you reached to the end of a line, and then you press 'Enter' to let the rest of words of the last line be written  on the next line, you notice that the words  writes on the words of  line which follows the line which is being edited. As a result, the text would be quite crazy.
Any comments would be highly appreciated
Thanks a lot,

Answer 1

Thanks very much,
Sometimes when I try to edit the content of PDF files which were created by converting an image into a PDF file, I notice that that Adobe Acrobat 8 Professional tells me that tells me that this content cannot be supported 
Even in the case of files created from word processing files, I notice that there are far too many restrictions in editing the content. For example, if you insert extra words or characters, the text does not automatically word-wrap. In addition, the "Enter key" does not work properly to insert a new line at the expected position. As a result, the text is quite crazy.