If you've already unchecked 'Use Simple File Sharing' like jrbob suggested, and you still don't have the 'Security' tab...try this:
Start | Control Panel | Administrative Tools | Local Security Policy | Security Settings | Local Policies | Security Options | In the RH pane, look for 'Network Access: Sharing and security model for local accounts' | Right click and select 'Properties' | Make sure 'Classic - local users authenticate as themselves' is selected.
Also, the following MSKB articles may be of some help to you...
HOW TO: Set, View, Change, or Remove File and Folder Permissions in Windows XP
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