Halo 2 Killtrocity Map Pack Mod Help, Stuck!, Stuck, can't build game.

Hi there,
I just joined.

I have a hard modded xbox, I downloaded the Killtrocity map pack, I gathered the maps required off my xbox through FTP, patched and signed all 49 maps, I then copied Halo2 to my PC and rebuilt the game as described in the readme's, It mentioned that I could delete a few things so I did. I then transfered the rebuilt game I made with the patched levels/mods etc and tried to play, it appeared under 'games saved on the hardrive' it starts up and says 'theres a problem with the disc, maybe dirty of damaged' obviously I'm not using a disc so I must have done something wrong, I then put everything back on that was allowed to be deleted but still no luck, I've been trying for a while now. Can someone how to set up the Halo2 Killtocity map pack properly?? Thankyou in advance