Freeradius and Windows Vista

I am running FR version 1.1.7 along with OpenSSL 0.9.8c on Debian. Authentication from XP works flawlessly and from what I have been able to tell from, with these versions I should be able to have Vista do PEAP/MSChapv2 authentication via Freeradius. However, it still seems that Vista stops the authentication process before the ntlm_auth call is made. Am I missing something obvious here? Thanks.