Hey So this is what happened. i got my mac like a week ago and i had it on a network through a hub with win XP. All of the sudden, might have been right after i did automatic updates, my connection is messing up. Whenever someone starts using internet on XP, mac internet will be down untill u renew your Ips and then when you start using the internet on a mac, win connection will go down . When you are on mac, XP internet will be down, untill you renew your ip, and when you start using net on XP, mac connection will go down. very wieird. i have tried everything .. completely eerything .. and so did other people do you guys think it might be some security update i installed ? is it possible to uninstall updates ? thanks mario.