Comment Wall Missing

Somehow I lost the comment wall I am not sure if it occurred
A. When I upgraded to the new releases
B. Uninstalled Guestbook I read you had made your own incorporated within the module so I uninstalled it. I did not see any inc files for Guestbook so I assume this to be true?
Is there a way to re-create/ enable it without uninstalling.

Also, since this no longer uses BIO content profile instead will it continue to auto create profiles upon registration?
Thanks so Much
Shannon