Executive Summary:

You can disable certain email attachment types in Windows Vista and Windows XP SP2 based on the file type and whether the file came from the Internet zone or the Restricted sites zone.
Use Network Access Quarantine Control to protect your network from computers that lack up-to-date anti-malware.
Network Access Protection enforces system health policies on computers trying to access your network.

Every month, Randy Franklin Smith answers your questions about Windows security. Click the links above to see individual Q&As from this month's column. Send your questions to Randy at rsmith@ultimatewindowssecurity.com.