Please try the following:
- Make sure you have a backup of the project you intend to use that is appropriate for the version you are working with.
- Use the Windows Add/Remove Program option to remove Ignition. (This will make sure the services get removed appropriately)
- After the uninstaller completes, rename any remaining Ignition folders that exist from the original install.
- Make sure you have an appropriate version of Java installed if you are installing 7.9 (8 or 9 is supported). If you are installing 8.0, the appropriate version of Java is included.
- Run the installer which should create a clean install and automatically startup Ignition
- Verify that Ignition is running. if it is running then restore the backup.
This process will ensure that Ignition starts properly, is working before your Gateway is restored and narrows down what may be wrong.
Garth