From this error, you can see it is a problem with permission on the host computer, where the shared folder is located.
X mount error(13): Permission denied Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
If the folder has the wrong name, you get something like this:
X Retrying with upper case share name mount error(6): No such device or address Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
If the IP address is wrong, you get this:
X Unable to find suitable address.
So the only solution I can think of to to set the permissions on your PC wide enough, so that every user on your network has read permissions to this shared folder. After that works, you can then experiment with usernames and passwords.