Change the Workgroup Name to remove it from your Home Network.
http://www.vistax64.com/tutorials/125089-workgroup-name-change.html
Above is a very good Tutorial on how to do the above.
Cheers.
Mick Murphy - Microsoft Partner
Remove computer from Workgroup
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Anonymous
How do I remove OLD computers from my Workgroup on my Vista computer
Windows for home | Previous Windows versions | Internet and connectivity
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Answer accepted by question author
Anonymous