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.
Note
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Workgroups provide a basis for file and printer sharing, but do not actually set up sharing for you. In contrast, in this version of Windows you can create or join a homegroup, which automatically turns on file and printer sharing on home networks. If you have a home network, we recommend creating or joining a homegroup. For more information, search for "homegroup" in Help and Support.
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Open System by clicking the Start button 
, right-clicking Computer, and then clicking Properties.
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Under Computer name, domain, and workgroup settings, click Change settings.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
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In the System Properties dialog box, click the Computer Name tab, and then click Change.
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In the Computer Name/Domain Changes dialog box, 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.
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.
