I just DL & installed B1. When it tried to register it got to 100% complete, then dropped back to 0%, then again got to 100% then crashed.
Now starting VSE crashes the app.
I'm using Windows XP with all hotfixes and SPs applied.
However, I used vsact to check the activation and it had been successful. I deactivated and reactivated it from the command line, both of which reported success, but the app still crashes on launch.