hi, the client config means the machine name comes through - reconfigure the client ot NOT use the windows login/password - is under the PEAP settings for the client supplicant. then they'll log in as plain username / password rather than the additional junk.
if you want to support random client configs you'll need to do a lot more work and debugging - I'm sure a consultant can help you further alan - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html