Do you mean Acrobat XI Standard? If so, it depend what you want to achieve... Might also help if you let us know what exactly is not "working properly".
With Acrobat Standard XI you should be able to add comments. There are a series of annotation tools that can add proofreader marks along with comments.
If you want to edit the PDF then that can be much harder.
There are blogs for proof readers that might provide more insight ant tools.
Thank you ... I was just wondering why I cannot see the final product in the same way as in word:-)
Thank you ... I know the answer to my question now:-)