I have 5 computers in my home. I'm using one of those wired/wireless routers so that my laptop can also work. My question is: Whenever someone comes over with their laptop, they are able to hook right into my network. Obviously, this means that anyone outside my house can do this also. What easy software can I get that will allow me to shut down any computer and especially any wireless computer. Does this mean I don't have a firewall?