I have a Win XP and Win 98 computers sharing Internet access via a Linksys cable router. How can I securely set them up to share files with eachother, while at the same time having Internet access on both. I have Zonealarm on the XP computer, but I am not sure of how to set this up, do I have to enable file and printer sharing? Is that secure so the outside Internet can't get in? Thanks!!!!