Locate your Netbeans installation and in it the etc/netbeans.conf file. Open it with any text editor, and locate the line containing netbeans_jdkhome. If it is commented out (line starts with #), then remove the # to enable the setting. Then, set the value to the path to your JDK. This might be somethiing like C:\Program Files\Java\jdk-10.0.1.
Try to run the program again, it should work now. At least, it did for me.
Also, ensure that you installed the Java Development Kit (JDK), not only the Java Runtime Environment (JRE). Netbeans needs the former to be installed in order to function.