New to forums..need help

Hi folks, i have a router issue. Ive been using Linksys products for years now. I have a BEFW11S4, its an older B router. I was using it on my pc for 2 years and i bought a new macbook about a month ago (which is the best thing since sliced bread btw) anyhow, all of a sudden this morning my network name wasnt showing up in my airport list. I tried connecting the router directly via a cable and it connects to the web admin setup, but very slowly. Most of the time i cant do anything. I also borrowed my friends B router (newer version though) and im having the same problems. I dont know whats going on. Im thinking about just going out and buying a new router, either a G linksys or maybe a d-link. Anyone have any suggestions? Im so frustrated. Thanks for the help