Well you could try a couple of things.
The simplest thing you could try is to just download a recent version of TripleA, install it and see if that enables you to either replace the old installation or allow you to uninstall it.
If that doesn't work, you could try to manually download java, install it, press Windows Key + Pause Key, open the advanced Tab, click on "Environment Variables", click on the lower "New" button.
The you get a dialog with 2 text fields.
Put EXE4J_JAVA_Home in the upper one, and the path to your newly installed java in the other one.
Note that it probably needs to end with /bin so it looks roughly like this C:\Program Files\Java\jre1.8.0_152\bin