I have installed the jre7 but I cannot find any javac.exe How come? And how can I set global variables in order to use all the exe file in the bin directory from anywhere in the computer?
The JRE (Java Runtime Environment) doesn't include the javac compiler. You need to install the JDK (Java Development Kit) if you want the javac compiler.
The Java download page is at
That page has links for the installation instructions.