Gateway Cluster Name

My data sources stopped refreshing.  I went to Manage Gateways, I am administrator, It only allows 1 gateway cluster, and there is a yellow warning icon next to it and I get the error message when I click "Show details", I got the message in my previous post.  I tried installing the new version on the same host, but that failed, and I can't remove it, I can't install on another machine because it says the name is already in use.

It appears that I have to delete all my data sources, delete the existing gateway from the service, but I still don't know how to remove it completely from the servers where it is installed?  Some remnant is apparenently left behind that prevents me from registering the same gateway from even a different machine entirely, and I can't get the existing instance to work either.