wlandymore: It seems more like you have file level permissions issue rather than mapping, although you'll want to look and see who your (Windows) user is being mapped to by running wcc -l <username>.
Anyways, what security is the volume/qtree you're trying to access - unix or NTFS? You'll want to ensure that the permissions on the resource you're exporting allow for that specific Windows user to access it. If unix security, you'll need to view/edit from nfs client, if windows you'll need a windows or Samba client.