This is the tutorial we've all been waiting for! If you've got an Orange Box and have lost the serial number, can't register because Steam hates you or you downloaded the DVDs through a torrent and now don't know what to do with them, here's the solution: 1) If you downloaded the .iso files through a torrent, mount them using Daemon Tools (google it). 2) Download this: RapidShare: 1-Click Webhosting (sorry about the Rapidshare, MegaUpload wasn't working properly) 3) Extract the above file 4) Copy all of the .sid, .sis and .sim files on both disks to the folder where you extracted the .rar file. 5) Run HL2_EP1.bat and Portal.bat 6) Copy the HL2_EP1 and Portal folders into the C:\games\Orangebox folder. 7) Use the shortcuts to play the game! Unfortunately, I can't get EP2 to work (as yet), but stay tuned!