Mac
5
to get a firewall, anti-virus, anti-spyware, anti-spam should cost about £25, nd then a router with build in firewall should be provided free with your isp, all security shold should really, or just very cheap.
My Cabe Co. Charter provides antivirus+Firewall to customers for Free if they have the 3Meg sevice and for $4.95 a month if they have the 256K service.
A router is avaliable for only $10 if you buy through them that has a built in firewall. Which is good because the same router is near $25 in the stores.