1. In Server Manager, click Manage and then select Add Roles and Features to start the Add Roles and Features Wizard.
   
   
2. On the Select installation type screen, select Role-based or feature-based installation.
   
   
3. Select the target server.
   
   
4. On the Select features screen, check the box next to .Net Framework 3.5 Features.
   
   
5. Install