If you have a mod chip, you should be using Slayer's or AID to gain access. Both will give you an IP address. If the file isn't being read, you may need to use different media. Try a CD-RW or a DVD. Make a dummy file to put on the CD so that it is large enough for the Xbox to pick it up. Here is how to make a dummy file.
Make a "dummy" file of about 4 GB and create another ISO but this time include the dummy file in the ISO. It doesnt matter what you name the dummy file. To make a dummy file copy and paste or type (whatever suits) this into command prompt in windows XP:
fsutil file createnew d:\temp\4gbDummyFile.txt 4194304000
That is for a DVD. For a CD, take off the zero at the end to make a 400meg file.
I need to find the person that wrote those instructions so I can give credit.
QUOTE(spookypictures @ Feb 19 2007, 07:51 PM)

I am having the same problem, however I did not change anything or add anything to my xbox. It has worked just fine up until this morning where I know only have access to a couple of things on my dashboard and the emulators, but no access to the games, dvdtoxbox, the media center and what have you. I'm not an expert at this, but i'm not stupid, can someone give me some advice.
Take a look at the pinned topics. There are some posts there on rebuilding the evox.ini file. If you still need help, start your own post so we can concentrate on your problem.