Install DFS as part of the file server role

1. Click Start, point to All Programs, point to Administrative Tools, and then click Server Manager.
2. In the console tree of Server Manager, right-click the Roles node, and then click Add Roles.
3. Follow the steps in the Add Roles Wizard, 

1-Before You Begin:

Click Next after you verify that the requirements listed on the page have been met.

2-Select Server Roles:

Select the File Services check box.

3-File Services:

Click Next.

4-Select Roles Services:

Select the Distributed File System check box to install both DFS Namespaces and DFS Replication.

To install DFS Namespaces or DFS Replication individually, select the check box that corresponds to the part of DFS that you want to install.

5-Create a DFS Namespace:

Select the Create a namespace later using the DFS Management snap-in in Server Manager check box.

6-Confirmation:

Click Install to install the file server role and DFS.

7-Installation Progress:

This page is automatically replaced by the Installation Results page when installation is completed.

8-Installation Results:

Note any errors, and then click Close to close the wizard.