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Java can be obtained free of charge from http://java.com/en/download/index.jsp . To test whether Java is installed on your server, open a command prompt and type "java --version". If you receive an error that Java is not a recognized program, download and install JRE 1.6 or later from the Oracle Java website. Note that for the agent software to work, 32-bit java is required. Both 64-bit and 32-bit can be installed on the same server. See https://www.java.com/en/download/manual.jsp and https://www.java.com/en/download/faq/java_win64bit.xml for more details on java installation.