Hold up a second.
If your box is truly softmodded, when your C:\ AND E:\ are hosed, your xbox will not boot, especially not an evox disc. That's the main difference between exploits and a chip. Sounds more like your box is tsop flashed.
Also, to link to your msdash, you need to hex your original xboxdash.xbe to look for f0nts rather than fonts, and place your original font files in c:\f0nts. Rename the original xboxdash.xbe to msdash.xbe and link to the new msdash.xbe in evox.