Going from Evox to XBMC the quick way. Download latest version 70 odd meg but fast download, decompress (extract). Inside the folder is xbmc and tools folder. Copy XBMC folder only to your Xbox partition either c: e: f: g:. Open tools folder (still on pc) and find xbe shortcut maker, launch (.net must be installed). Make a shortcut to point to wherever you put your XBMC folder example "c:\xbmc\default.xbe". Then it asks what to call the file, call it evoxdash.xbe and save it to say your desktop. It will produce a file thats an xbe about 60kb or so. Drop that file to the root of your xbox c: drive. Done, reboot. Delete any unwanted evox stuff ie folders - skins -ini but not the new evoxdash.xbe as thats the boot shortcut for xbmc.
Sorry bad info, the simple shortcut maker isnt in this package however its not hard to find, check out the software section at this main site.