What Intrusion Detection/Prevention software works on Vista 64?

Currently using Cisco Security Agent (CSA) as host based Intrusion

Detection/Prevention software. Went to Vista 64, but found out CSA is not

supported. Cisco claims there is no zero day protection software that runs on

Vista 64 because Microsoft has not opened up enough API's on Vista 64

platform. So I have searched the internet, but no Intrusion software is

listed that explicitely states that it supports Vista 64. (CSA does support

Vista 32.)

Does anyone know of any Intrusion Detection/Prevention software (with zero

day protection) that explicitely states that it supports Vista 64?

Thanks ...