hi
as for me you need 3 solutions
1-) fristly you need IPS solutions
http://www.hpenterprisesecurity.com/products/hp-tippingpoint-network-security/
many Hp network switch have some security protocol (connection rate filtering,dos protection)etc.
but they are insufficient. you can dynamically prevent network users connection to torrent site with IPS device
2-) wireless IPS solutions
http://h17007.www1.hp.com/us/en/products/wireless/HP_Mobility_Security_IDS_IPS_System_Series/index.aspx
- Accurately autoclassifies APs and client devices using patented autoclassification techniques to block genuine threats
- Automatically prevents denial-of-service attacks; prevents more than 20 threats simultaneously from a single sensor while continuing to scan for threats
- Locates unauthorized WiFi devices on floor map for quick removal
- Blocks unauthorized traffic without network disruption
- Sends an alarm when a policy violation occurs via email, SNMP, and syslog
3- of course anti-virus solutions :)