Don't rely on WEP, there are readily available programs which will "crack" this in a few minutes. Use WPA. I also have MAC code addressing, which should stop any non authorized computer from accessing my router. I was also told by a Computer magazine helpdesk NOT to rely on a routers firewall either, but use a software firewall in each P.C. This will give better protection against any rogue programmes that may be hiding, from gaining internet access without your knowledge.