You can check the Windows event viewer, it may have details. It sounds like maybe 'java' isn't on the Path environment variable for the system user? Can you confirm you've added the C:\Path\to\jdk\bin\ to the system Path variable?
After that, I'd wonder if the paths in the wrapper.conf were correctly adjusted to where you installed Mango. I'll give the process a try tomorrow. It's been a long time since I did a Windows service installation so I'm not remembering all the subtleties This is a thread where someone ran into issues and figured them out: https://forum.infiniteautomation.com/topic/2270/windows-service-setup