If you have Windows Server 2008 you can use NAP (Network Access Protection) to protect your network and now you can integrate with FCS (Forefront Client Security).
You can use FCS to protect your PC and NAP can this functionality.
“The Microsoft Forefront Integration Kit for Network Access Protection helps customers defend against malware threats by integrating two key Microsoft security technologies: Forefront Client Security and the new Network Access Protection feature in Windows Server® 2008.
The Kit helps protect customers by allowing them to configure health policies to monitor the state of Forefront Client Security in real time across their networks, and to remediate problems.”
You can see a video at NAP Blog Team.
More information here.