said by Al198947 :
Is the reason why I don't see Dec 8th because there was 0 bandwidth usage?
Exactly...no need to blame rogers bandwidth counter when the problem in with in your network. Best solution is to re install windows on all computers if they are infected and use mac filtering all the time with a strong password. Use an online password generator for WPA2 and use the strongest security. Also make sure anti virus and firewall etc are all up to date on all computers. Then just periodically make sure no new macs are trying to get an IP, always set static IPs for all computers and disable DHCP if you can. That's would be the ideal security set up for a home user IMO.