I can upload video to my computer and watch it and here the audio on windows media player, However when I watch it in movie studio 9 I can not hear any of the original audio, nor do i see a special row for this audio.
Where did the video come from?
What is the file extension?
What are the video and audio encoders used?
There is much more information that might be relevant. However, this will get you started towards an answer. Right-click on the event, click Properties->General. Or you can use a utility like MediaInfo.
I don't think 'reprocessing' is necessary. Close Vegas, then open it and load your project again. If Vegas can use the new codec then the audio will be there. If not, it's either not the right codec, or it's one that Vegas doesn't understand.
If the OP would provide a little basic information, such as the origin of the files, their extension, and the video and audio encoders, it might be possible to give him some specific suggestions or choices.
As to 'reprocessing' then: if the video is rendered without the proper codec (=without sound or without video) then 'reprocessing' (re-rendering) is necessary .