This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
For some reason your Java installation is looking in the wrong place for the Java compiler (you see it has "jre6" in the path, instead of the directory where you have the JDK installed).
What exactly does your PATH look like; what do you get as the answer from the following command: echo %PATH%
Did you also set a CLASSPATH? If yes, then unset it (delete the environment variable).
Where do you get this "Unable to locate the Javac Compiler" error message? On the command prompt, when you try to compile a class? Or in an IDE? If it is in an IDE, then point the IDE to your JDK directory, not the JRE directory.