2 computers, 1 with win2000, other with xp, connected through comcast supplied motorola SB4220 Surfboard cable modem and lynksys 5-port workgroup hub, no longer have simultaneous internet access which we did have for months. May have something to do with a virus, but both computers scan clean with panda. By unplugging modem for 45 seconds, replugging, and rebooting either computer can gain internet access. would also like to connect xbox. Is the hub a likely problem? should we have a switch instead?