How do I fix a glitch in Saints Row: The Third?

I'm in Stag Party. I'm supposed to destroy VTols but only two show up. No third one. I'm reinstalling the game right now hoping that works because if not I can't beat the game. :(

EDIT: I decided to give the 360 a break. I'll try again later. Not sure what's going on though...

Reinstalling seems to have worked. I thought for sure I wasn't gonna be able to beat the game due to a stupid glitch/programming error. That happened to me once. Got to the end of the game, last door and the stupid devs forgot to activate it.

I actually only experienced one glitch and it was right at the beginning of the game in the first building, for some reason I could not open the door. I just reloaded the previous checkpoint and it fixed the problem.

The first Guardian Angel mission my homie died despite no enemies. A couple tries later no enemies showed up again and there was no progress at all. :? Beat that mission on my next try though...

Yeah these consoles are built a lot like PC's when it comes to troubleshooting problems. First thing I always do if I'm experiencing something I shouldn't be is clearing the cache, and if that doesn't do the trick then re-install the game.

I was actually in a live chat with a Microsoft assistant, and he recommended to clear the cache every few months in general, it helps everything run smoother.