What causes a corrupt Xbox profile?

All you got to do is go to settings, memory and gamer profiles. The corrupted one should be marked wth a caution sign.=MAKE SURE YOU'RE SIGNED IN TO LIVE!==Next, delete the profile that's corruped. Be sure to choose "Profile Only", not "Profiles and items" or your saves wll get deleted.=Then, recover your profile fom the main Xbox360 Dashboard, not Xbox360 Guide.=Lastly, enter your details, recover and pray that you account is still in one piece.=