Occasionally, you might be unable to uninstall the server because it is "still running". This tutorial details how to completely shut it down on Windows.
Secondly, you will want some more detail from the Task Manager. Expand the Task Manager by selecting "More details" in the bottom left.
Once you have the detailed view open, you will want to find the Unified Remote process in the list.
The server has now been completely shut down, and you should be able to continue with your uninstall / update.