Since you're working with Windows, it may be easier to utilize some of the utilities from the Sysinternals suite of tools. PsService might end up showing you the same thing that Windows' service manager is showing. Another alternative is the PsList, which provides information about running processes. You can have your script just do a system call to utilize these utilities.
(NOTE: The first time you run one of the utilities from Sysinternals will have a GUI pop up dealing with the EULA. Subsequent times running the utilities does not encounter the EULA pop up.)