Seems I was wrong, the JDK it is.
I added a SYSTEM PATH
JAVA_HOME C:\Program Files\Java\jdk1.8.0_92
restarted my computer
for good measure clicked the install exe for Java then Android Studio
The virtual device emulators loaded OK, but to get them to work I’ll need to do a bit more setting things up, which I’m not likely to get to any time soon. .