Here i found anti ddos for windows servers
http://english.ircfast.com/lv/group/view/kl224646/D-Guard_Anti-DDoS_Firewall.htm (http://\\\"http://english.ircfast.com/lv/group/view/kl224646/D-Guard_Anti-DDoS_Firewall.htm\\\")
check maybe this can help you guys :).