FULL PRODUCT VERSION :
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) Client VM (build 25.131-b11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.3.9600]

A DESCRIPTION OF THE PROBLEM :
When launching JRE installer, if the JRE is already installed, it will be automatically uninstalled without prompting.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Install JRE 1.8.0_131 ( jre-8u131-windows-i586.exe file)
When installation is finished, launch again jre-8u131-windows-i586.exe file
A window appears ( Welcom to JAVA) and the user is prompted to click "Install" in order to install JRE. Click Cancel.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
JRE 1.8.0_131 still installed.
ACTUAL -
JRE 1.8.0_131 is uninstalled. That means that if the user double clicks by mistake on installer file, JRE is automatically uninstalled without prompting the user.

REPRODUCIBILITY :
This bug can be reproduced always.