We have verified that Vista Build 5384.4 (Beta 2) can be run from a mounted image via Alcohol 120% or Daemon Tools.
If you have any issues with either of those and Beta 2, please post below. Please note: this doesn't mean that either of them work from within Vista, just that you can install Vista from them.
If you have any issues with either of those and Beta 2, please post below. Please note: this doesn't mean that either of them work from within Vista, just that you can install Vista from them.