[quote name='seanr1221']How do you do that again? Hold A when the system is starting up?[/QUOTE]
I was joking, but there is another (more effective) way:
Go to the dashboard.
Go to the system tab
Select memory
Highlight your hard drive
Press Y
Press X, X, LB, RB, X, X
Say yes when prompted to do maintenance on your hard drive.
This removes all previous title updates and prompts you to redownload new ones.
But, I don't think that works.