ReadyNAS 1100 Can't delete folder Win 7

Thanks StephenB and vandermerewe

I have the following settings currently
CIFS -
Default Access: Read/write
Share Access Restrictions
all unchecked axcept
Checked - Allow guest access

Advanced CIFS Permission
Checked - Automatically set permissions on new files and folders.
Checked - Do not allow ACL changes to be more restrictive than this.

When new files are created over CIFS, set file permission as follows. Group rights are permission for members of the file owner's group. Everyone refers to all other users not in the file owner's group.
Group rights: Read/write
Everyone rights: Read/write

When new folders are created over CIFS, set folder permission as follows. Group rights are permission for members of the folder owner's group. Everyone refers to all other users not in the folder owner's group.
Group rights: Read/write
Everyone rights: Read/write

Advanced Options
Advanced Share Permission

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

Checked - Grant rename and delete privileges to non-owner of files.

From Win7 Explorer I can get to files. Properties on folders and files are read-only filled in square, not checked and not blank
When I delete a folder it disappears will reappear if I move away from the directory and refresh its contents

Thanks for your help