this article might help out.. but the reason im posting this is cause lots of people have wireless, yet fail to secure it. Allowing your neighbours to use up your bandwidth, or use it to do illegal things. Or in the case of a friend of mine, use it to get his credit card number as he did transactions over wireless when it was un-secure (thankfully his neighbour was a nice person and told him about it rather than use his credit card info)
http://www.microsoft.com/windowsxp/using/networki..._05february10.mspx