Setting Up Secure Internet Access

[brdy59701]

I want to set up security on my network. I want it so only certain computers can access the internet. I only have two computers, one desktop and one laptop, to connect. I have a linksys wireless router that is connected to a cable modem. The only security that i can find is on the router but it only secures wireless access. This is good, but the router just needs to be reset or unplugged and anyone can access the internet again. So what I need is a way to restrict access through both wireless and ethernet and not be able to disable it by just pushing reset.