Sorry you are having problems with it. Not sure what may be causing that. Nothing inherently bad or nefarious with Java itself.
There is a difference between Java and the Java web plugin. The Java web stuff is a security risk and most sites don't even put Java applets in their web pages anymore, so it's best to just uninstall the plugin.
Java is the most popular programming language today.
http://www.tiobe.com/tiobe-index/ The Android development kit uses Java as the source code for apps. The advantage to using Java is write once, run on any computer with a Java VM.
But Java is not compiled to run as a Windows executable, or for any specific platform.
It needs a runtime environment.
Java Runtime Environment (
JRE) is a software package that contains what is required to run a Java program. The
Oracle Corporation, which owns the Java trademark, distributes a Java Runtime environment with their Java Virtual Machine. It is supported on Linux, Mac, and Windows.