Missing Security Tab on Windows XP Clients
You might not see the security tab for a file or folder when using an XP client for the following reasons:
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You do not have enough permissions to see the security settings of the file or folder
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Simplified file sharing is enabled on your client
 
To disable simplified file sharing, choose Control Panel→Folder Options→View, deselect Use Simple File Sharing (Recommended), and click Apply.
For more information about disabling simplified file sharing and setting permissions on a shared folder, see Microsoft knowledge base article 307874.