If all else fails...
I would first try a system restore and go to the point before you updated NetBeans.
If that doesn't work,
install java if you don't have it already, and then set up your
classpath variables using this guide. Then you can run things from the command line. All you have to do is navigate to your directory using the command prompt, and then use the command
javac to compile and
java to run the program. For example, if you had a HelloWorld.java file you would navigate to that directory in the command prompt and type
javac HelloWorld.java. Then to run the program, you type
java HelloWorld.
Sarah would be able to help you get all that set up if needs be.