Sometimes while playing either of the Halo's, a little screen will pop us saying "gathering exception data." What does this mean and how can I stop it?
Actually, that means you've likely got one (OR MORE!) of the following problems, in order from MOST-to-least likely:
0) Bad/old/outdated drivers, most likely video or audio,
1) Corrupt Halo install,
2) Dirty computer/bad airflow causing overheating,
3) Memory that's going bad,
4) Graphics device or CPU overheating or dying.
I cannot diagnose these over chat, so you'll have to look in to each and narrow it down yourself....