Permissions on network shares

I recently ran into a problem after removing a domain with AD and putting in a workgroup enviornment. All XP users have a folder on the W2k server to store files. Since removing the domain and putting in the workgroup some of these user folders are not accessible. Some not all! That’s the odd part. I read something on MS about efs encrypted filed, but I do not see any encrytion. I have checked the permissions and they seem to be fine. Each user is in the users group and users group had full control over these folders. I appreciate any help on this.
Thanks