Microsoft : Windows 2012 R2 GUI Missing after remove .Net Frame 4.5

Issue : GUI Missing after reboot

Solve:

1.  Run the below commands in the Server Core’s command prompt window to help you recover:
DISM.exe /online /enable-feature /all /featurename:NetFx4
DISM.exe /online /enable-feature /all /featurename:MicrosoftWindowsPowerShell

2.  The above commands will re-install .Net 4.0 and PowerShell on the server. Once PowerShell is installed, you can add the Graphical Shell (Windows Explorer) using the following command:
Install-WindowsFeature Server-Gui-Shell, Server-Gui-Mgmt-Infra

3.  Once the GUI Shell is installed, you will need to restart the server with the following command:
Restart-Computer

 Source:

 https://social.technet.microsoft.com/Forums/ie/en-US/e46b5087-4780-4a50-803f-4cf340f8db5c/windows-server-2012-r2-std-gui-went-missing-after-uninstalling-net-frame-45?forum=winserver8gen