new here with questions

Hello all at the forum

I have ps2 gamecube dreamcast(with orig nintendo emu) xbox and wii. Just a lil bout me.
I have a modded xbox that was already done when i got it about a year ago. Recently it stopped working normally. I cannot play any of the games on the hdd and cannot put any games on it. It used to say 'evox' at startup. Now it has the executer logo on the bottom of the screen and I cannot load any of the apps.
From what I have been reading it looks like evox needs to be re-installed? Could someone offer some help and also point me in the direction of trying to understand how this all works?

thanks
(sorry for the long first post)