Can anyone refer me a good firewall which is fast and without any other utilities like anti-spam, anti-spyware... I am ready to pay any price for that... i.e. I'm not worried about the high cost... again I need a basic firewall which gives maximum performance still maintaining high security and without any other features because I already use a good anti-virus, a good anti-spyware... so I don't need them to be integrated into the firewall...