OK, so I went to my brother's house to play some Age of Empires 2 multiplayer via the lan option. This worked the last time I was over there. The problem is, this time whenever I joined his network a message box popped up and told me the computer had a critical error and would reset in one minute. This happened whether I joined his network wirelessly or with a cord. I purged it with every antivirus program under the sun and it still didn't work. However, the computer works fine on my home network. I have windows vista and he has xp, but this didn't stop us from playing last time.
Any idea what the problem might be? (or perhaps an alternate way to play AOE2 multiplayer with 3 or more players?)