“certain black levels that bleed out and create noise…”
As Steve said, the Alpha Channel mode selected in Vegas must match the Alpha Channel mode the file was created with. Try Straight, Premultiplied or Premultiplied (dirty)
I have two LCD monitors connected to my PC. Datacolor Spyder is a peace of hardware and software that helps to set the correct colors of the monitors connected to my pc.
I have read that they have a tool that allows to color correct HDTVs too.