I have a cheap laptop with a cheap integrated wireless card.
No matter what I try, I cannot get it to work with a secured wireless connection.
The only way for it to connect is to leave my wireless connection open.
This lets all of my neighbors in on my connection though.
I first tried to use the Access Restrictions feature, but found that only blocked the Internet.
People could still connect to my web connection.
Then I discovered my Linksys WRT54G router has a Wireless MAC Filter feature.