You can uninstall All versions of Java to start over if you prefer.Note: You can have both 32bit and 64bit versions of Java on your computer at the same time. If you did not install the same 32/64 bit version of Java as you did for Ignition, then Ignition will not start. Java should be installed in the same program files folder as Ignition.If you have a 64bit computer, there will be both a 'Program Files' and 'Program Files (x86)' folder. You should be able to find it in the computer's Program Files folder.
Step 1: Confirm Java and Ignition versions
You can also watch a video of this process by going here. Below are the steps to reset the path in Ignition. If you have changed your Java installation recently and now Igniton won't start, it's probably caused by the path to Java being altered.