Sound Card/Drivers with same result
Sound card drivers can also cause this freeze up after the initial movies. Originally, I had no problems playing Legion. However, sometime around the installation of Legion, the sound in another game (Strange Adventures in Infinite Space) stopped working. I later found out that this appeared to be a problem with Direct Sound, and the stuttering sound was eventually fixed by turning off all hardware acceleration. Unfortunately, after I did this Legion exhibited the behavior listed above. However, by going back in an re-enabling hardware acceleration, Legion now works.
Obviously, I can just keep changing this back and forth, but I thought that a report here might shed some light for other people that might have similiar problems.
Now, I would like to get a new driver for my sound card.....
but DELL has nothing but the originial drivers

and Turtle Beach directs me right back to DELL since it was a custom OEM card

.
I have to suspect some DLL somewhere has changed detrimentally, but since I can work around the problem, I am not too interested in diving through Microsoft's mess. So I report this, but don't really expect to do much better, (well, unless I buy a *supported* sound card

).