It is not clear what you are trying to do.
How many rooms?
You want to use PC speakers in each room and stream to them from what sources (iPod and what else)?
You want to use a PC in each room to receive the audio?
Do you want the capability to play different sources in different rooms at the same time?
The apps above are designed to stream audio from a computer to a wifi connected device. You would need such a device for each room and I don't think you would have the ability to play different things at the same time.