Tomcat allows developer to set tomcat instance as window service. You can install, update or remove the service base on the following document.
Most of the time, we are concerned about JVM options in Tomcat window service. Install, update and delete is not an issue, these actions can be easily done by //IS //US and //DS.
Sometime, you may face problems such as "How to remove 1 JVM options from the current JVM options", or "I cannot start tomcat server after updating JVM options"
You can manually modify Tomcat JVM option at the registry key "HLM\Software\Apache Software Foundation\Procrun 2.0\
All you need is to reset the Options registry key. Also, you can tune JvmMs and JVMMx here too.