ReadyNAS 1100 Can't delete folder Win 7

Security Mode
Share - checked
Worksgroup: workgroupname

I don't have any users set up. I have been using the NAS shared so that all could have access to all files. (Maybe not a good idea?)
Share(s) - two shares with same settings:
Name=sharename
Primary Group=nogroup
Quota=0

CIFS Settings
Share Name: backup
Default Access: Read/Write
Share Access Restrictions - not checked
Share Display Option - not checked
Recycle Bin - not checked
Opportunistic Locking - not checked

AFP (also available as and advertised over Bonjour) Settings:
Default Access: Read/Write

HTTP/S Settings
Default Access: Read/Write

Advanced Options Settings
Share folder owner: nobody
Share folder group: nogroup

Share folder owner rights: read/write
Share folder group rights: read/write
Share folder everyone rights: read/write
Grant rename and delete privileges to non-owner of files is checked

I have not made any changes yet. I wanted to give you more information before changing anything.
I appreciate your help.