I have recently installed halo 1 for pc (full version). i played campaign for a while got bored and wanted to try the multiplayer. i clicked multiplayer >internet and it showed an update is available. if i click cancel, it goes back to chooses internet/lan/create game. when i click download update, it closes halo, downloads. and starts installing the update. all normal so far. then, an error message appears and says - Cannot locate the Halo CD-ROM...Please insert the correct halo CD-ROM, select OK and restart application. so i put in the cd, click ok, open halo again. same message. now i cannot open halo again without reinstalling it from the cd. if anyone can help, please do!!