NTLM Passwords Linux NAS passwords

in RC2 this forum gave me the following solution to a problem accessing linux
devices - i.e. password format was not accepted due NTLM.

- Click Start
- Click Control Panel
- Click System and Maintenance
- Click Administrative Tools
- Double-Click Local Security Policy
- In the left pane, click the triangle next to Local Policy
- In the left pane, click Security Options
- In the right pane near the bottom, double-click "Network security: LAN
manager authentication level"
- Click the drop-down box, and click "Send LM & NTLM - use NTLMv2 session
security if negotiated"
- Click OK

The solution worked perfectly - BUT now I have a the final version (Vista
Home - bought in a shop) I have the same problem except that when I try to
follow the procedure above there is no 'Local Security Policy' option in the
Administrative Tools section of the control panel.

Can anyone tell me where I can access the 'Local Security Policy' settings??

Thanks, SteveK