Hi, I have several computers to hook up to the internet; 4 to be exact. We have bought a router, installed it into the main system, but are still having problems getting everyone onto the internet. Each computer has a wireless plug in, and we keep getting "you have no certificate for use" on the other systems. What are we doing wrong?? We have 3 desktops and a laptop to connect together, are we not doing something that we should? PLEASE, HELP!! We have the main computer with the internet connection and we want to add two other desktops and a laptop to the internet. Is it too many systems on our router? We have a Belkin Router that is supposed to handle 5 links. Please, let me know what we are doing wrong!! Thank you!!