Hello,
Try starting the service again (this is to cause the service startup issue again).
Then, verify for files that were changed at the "work" folder of the instance (\usr\sap\SID\INSTANCE\work).
You can also double click at the service and confirm that it is pointing to the correct file path (sapstartsrv.exe) and profile file (the file indicated after the "pf=" argument of the service command line).
Regards,
Isaías