Join or create a workgroup
When you set up a network, Windows automatically creates a workgroup and gives it a name. You can join an existing workgroup on a network or create a new one.
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Open System by clicking the Start button 
, clicking Control Panel, clicking System and Maintenance, and then clicking System.
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Under Computer Name, Domain, and Workgroup Settings, click Change settings.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
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Click the Computer Name tab, and then click Change.
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Under Member of, click Workgroup, and then do one of the following:
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To join an existing workgroup, type the name of the workgroup that you want to join, and then click OK.
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To create a new workgroup, type the name of the workgroup that you want to create, and then click OK.
If you change the name of an existing workgroup, a new workgroup will be created with that name.
The Computer Name/Domain Changes dialog box
If your computer was a member of a domain before you joined the workgroup, it will be removed from the domain and your computer account on that domain will be disabled.
