Usin Softmods with halo 2

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Ok well, i have a modded xbox hooked up with XboxMediaCenter and it won't let me get onto xboxlive. when the troubleshooter gets to ip adress it says No Connection. could anyone help me get past this problem i'm facing. but i do have alot of modded maps, also i downloaded dothalo and it said that a .dll was not found or some crap like that, i think it may have somthing to do with me not having windows XP. could somebody help me out. Thanx