which INTERNET SECURITY or ANTI-VIRUS is best for mac OS x leopard ....

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Board: Intel dg41rq motherboard.,Processor: Intel core2duo with 2.93 ghz.,Ram:1GB RAM ddr2.,Graphic card : nvidia msi nx 8400 gs 512mb pci-e.,Ethernet : Realtek RTl8168D(P)8111D(P) PCI-E.,Display: LG 17 inch CRT monitor., HD : SATA 250 gb(internal).,OS : windows xp sp3 on 1st partition & iatkos v7 10.5.7 on 2nd partition .

First off, try reading this..
http://www.firewallguide.com/macintosh.htm
it helps a lot, there u have a lot of antiviruses, anitspyware, internet security etc. If u got some other problem let us know Peace