I'm on my 3rd xecuter 3 install on a 1.6 xbox. Everything was going great. I was loading it up with all the goodies I have on my own xbox. No problems what so ever. Then out of nowhere, when I go to turn it on I get error code 21 whether I'm loading the xbmc dash or MS's. And I know better than to write over critical files. So what gives? I have never run across this before.