Issue:
security tweaks and fixes

Solution:
Can't enable guest account
How Inheritance Affects File and Folder Permissions
"Not accessible. You may not have permission to use this network resource"
The Sharing tab is not visible
Understand Allow and Deny permissions
Why can't I have permission button while setup sharing on XP

Can't enable guest account

To enable guest account on w2k/xp, you must logon as administrator.

How Inheritance Affects File and Folder Permissions

After you set permissions on a parent folder, new files and subfolders that are created in the folder inherit these permissions. If you do not want the files and folders to inherit permissions, click This folder only in the Apply onto box when you set up special permissions for the parent folder. If you want to prevent only certain files or subfolders from inheriting permissions, right-click the file or subfolder, click Properties, click the Security tab, click Advanced, and then click to clear the Inherit from parent the permission entries that apply to child objects. Include these with entries explicitly defined here check box.

If the check boxes are not available, the file or folder has inherited permissions from the parent folder. There are three ways to make changes to inherited permissions:

• Make the changes to the parent folder so that the file or folder inherits the permissions.
• Click to select the opposite permission (Allow or Deny) to override the inherited permission.
• Click to clear the Inherit from parent the permission entries that apply to child objects. Include these with entries explicitly defined here check box. When you do this, you can make changes to the permissions or remove the user or group from the permissions list. However, the file or folder does not inherit permissions from the parent folder.

Not accessible. You may not have permission to use this network resource

Symptom: Your WinXP,  in a peer-to-peer mixed network,  may receive the following error when you double-click My Network Places/Computers Near Me: <Workgroup Name> is not accessible. You may not have permission to use this network resource. Resolution: 1) Enable NetBIOS over TCP/IP on one or more computers in the workgroup. To do that, go to properties of Local Area Connection>properties of Internet Protocol (TCP/IP)>General> Advanced>WINS, check Enable NetBIOS over TCP/IP (If you have a DHCP-assigned IP address, select Use NetBIOS setting from the DHCP server ). 2) Make sure the Computer Browser service is started.

The Sharing tab is not visible

The sharing tab is not visible if you are logged on to a machine with an account that does not have adequate rights. 

Understand Allow and Deny permissions

A: 1) Allow permissions are cumulative, so a user's permissions are determined by the cumulative effect of all of the groups to which the user belongs. 2) Deny permissions override Allow permissions. Use caution when you apply Deny permissions.

Why can't I have permission button while setup sharing on XP

The reason you can't see the permission is because the XP simple file sharing is enabled. To disable simple file sharing, go to windows explorer>tools>folder options>view, uncheck use simple file sharing. Just remember that, after disabling simple file sharing, some users may have
difficulty to access the sharing folders.