Go to Server Manager.
Click Manage in the upper right corner.
Click Add Roles and Features.
Click Next > Next > Next.
At Server Selection select your server.
Click Next > Next.
At Features expand User Interfaces and Infrastructure.
Check Desktop Experience.
If an Add Roles and Features Wizard window pops up with a list of features required for Desktop Experience , just click Add Features.
Click Next > Install.
Restart your server.