To me it looks like a defective disc and / or reader.
Hey James,
Just so you know, I'm having the same problem, and I updated to 6.2.0.2 beta and get an error message at 46%. With 6.2.0.1 it stopped at 48%. I've cleaned the disc, and haven't had a problem like this before (except with Blades of Glory a few weeks ago, which was fixed with an update).
I believe the disc and my reader are working properly.