Make sure you have the Java Development kit installed: http://java.sun.com/j2se/1.5.0/download.jsp (You want JDK 5.0 Update 6) Extract the attached file into your base twcore directory and double click on "bld.bat" This will build the core so you can run it. In the future, you can compile this file like the readme says, by opening up a command prompt in the folder and typing "javac BuildTWCore.java". If you get any error messages from bld or runbots, run them with the command prompt instead of double clicking and copy what they say into a reply. BuildTWCore.zip