Local Policies in Home Premium

I'm currently trying to connect to my Univerity's Intranet, they have a
tutorial on how to change the policies in XP Home, Pro but not Vista.

I have to:

- Change the 'Security: LAN Manager Authentication Level

- to "Send NTLMv2 Response only. RefuseLM and NTLM."

But I cannot for the life of me find th security policy application in
Admin Tools, nor is the registry screens shots any help from the
Tutorial. Can anyone shed light on how to do this?