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I tried to install Telnet Client feature using Server Manager in a Windows Server 2016 and now is completely stuck at running stage. Now I just want to cancel this but there is no option anywhere. Reboot is not an option. I googled for a solution and was not able to find anything useful. I have tried to run the installation on Powershell and it gets stuck at 20%, also removing it but is not listed obviously. I tried also to kill the "msiserver" task and restart Windows Installer. I found also a possible solution to rename the Server Manager cache registry. No results.