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.
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.
Open System by clicking the Start button , right-clicking Computer, and then clicking Properties.
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.
In the System Properties dialog box, click the Computer Name tab, and then click Change.
In the Computer Name/Domain Changes dialog box, under Member of, click Workgroup, and then do one of the following:
To join an existing workgroup, type the name of the workgroup that you want to join, and then click OK.
To create a new workgroup, type the name of the workgroup that you want to create, and then click OK.
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.
If your network includes computers running Windows XP, you might need to change the workgroup name on those computers to match the workgroup name on the computers running this version of Windows or Windows Vista so that you can see and connect to all computers on your network.