Help me w/wireless security?

[newomij]

If I'm in the wrong forum, inform me which is the correct forum and I will repost there. I have a Verizon supplied Westell Versalink 327W wireless router/modem, a D-Link wireless card on my PC, and a Pentium 4 computer running XP Pro. I have searched this site for help previously supplied to set up security that will prevent others in the neighborhood from using my internet access and/or getting information that I do not want them to have but found nothing. How do I set up the sucurity so that my wireless conectivity is MY wireless conectivity and then how do I share that same secure connection with my wifes computer?

[Statica]

Moved to the networking forum: This is a good starter thread on wireless security.