go to http://sehsgames.weebly.com/halo-combat-evolved.html and then click "download". a tab will open up. click "download anyway". it will take while to download, but it's completely safe. when you finish downloading, then click what it tells you to. when the game finally opens, hit campaign or multiplayer. on multiplayer, to make a server, click "create LAN". for other people to join your game, then they need to click "direct ip" and you need to hold F1 and let them type in the ip adress at the bottom. have fun!