Mac Forums

A few months ago I got a Belkin Wireless Router to get internet access for my laptop. At first it was secure with a password but it started acting up so I restarted it and now it's insecure and I think my neighbor's are picking up on my signal and doing weird stuff because on my itunes library it says under shared files my neighbor's name. what's the risk with this. how can i make it secure again and why does that show up on my itunes? thanks!