Debugging Windows Service Startup
Open the task manager. Check if there is a "GigaFlow.exe" application/process running.
If so, select it and then click the "End Task" button.
Open up an administrators command prompt. Navigate to the folder where GigaFlow.exe is located (default:c:\GigaFlow\Flow\resources). Run
The output of this should tell you what the problem is (i.e. java not installed, no database access or some invalid parameter in the GigaFlow.ini file)
If java hasn't been found, re-run the java installer as sometimes customers try to upgrade the JRE which actually removes it from the registyr. (if you ran the full installer, the standalone java installer will be available in c:\GigaFlow\Flow\dist\jre-8*)