I have installed splunk forwarder for a windows servers and the service must be initialized when the server starts but some times the service doesn't start so I need to know how to see why the service doesn't start or how I must configure the service.
Usually using CLI you reach to display start-up errors (e.g. memory or grants problems).
Then share these messages to better understand your problem.
If this problem is about an active customer, you can also open a case to Splunk Support and be supported by them.