Use the sticky thread at the top on how to make a SLP XP Pro CD. Open the WINNT.SIF file with notepad and swap in a SLP MCE key instead. The key is what triggers setup to install Media Center addon. Without it, its just a standard Professional install. You will also need a disk with the Media Center setup files which are in a folder called CMPNENTS or you can add the CMPNENTS folder at the root of the XP setup ISO and burn it to one DVD so you wont have to change disks during setup.