Same problem here. It also keeps installing a definition update for MSE.

I dusted off Lego Star Wars II: the original trilogy a couple of days ago, and for some reason everytime I exit the generator room (place where in the story Obi Wan turns off the power) in freeplay mode, it locks up. I have uninstalled, reinstalled, erased unused disc space, so it doesn't reuse the old file, cleaned the disc, and it still happens.:?

Any ideas??