I did have the same problem too with the slayer my xbox did not recognize it. If you downloaded as an iso already. You must redo the iso formatt because the way they did it won't work. I have to extract everything from it and redo the iso again with xiso. I prepared two CdRW i use memorex 4x The auto installer slayer cd did not work and the the second one which i put together without any dummy files. I created the second Cd with all the apps i was going to need like xbmp,yamp,xmame,xkawak,xalpha,hddloader,xcommander, and more and i use Xiso to turn it into iso and it work perfectly with the xbox. So whenever you download something in iso format you must extract it and redo the iso again so that it will work and try to burn it at a slow speed so that it will work perfectly because i try 4x xbox did not recognize and then i burn at 2x it did recognize only that is to slow and it took 40 minutes to burn because i have a total of 700Mb of apps on it.