General Computer Questions

Just Reformatted my Toshiba Libretto and now it won’t connect thru my wireless router/comcast, connects fine thru my neighbor’s? My Dell and my Wife’s Google Phone connect fine my router. I’ve tried rebooting the Router and the Laptop,repairing the connection, renewing the IP, Flushing the DNS Cache, still no joy… any ideas?

why there is limited or no connectivity when i surf the net.