I have a home network setup and I would like to change network names in network and sharing center how do I ?

listed is the name of the computer jack-pc then it is listed yet 3 more variations. all I want to be listed is Jack then my wifes Shawnda, then the xbox 360 media center and so on. I have changed the computer name but it is now listed jacks:jack: I just want to start again from scratch but need help!I have a home network setup and I would like to change network names in network and sharing center how do I ?
Try shutting down all the computers at the same time. This might clear out the names from being used on the network.

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