Basically what is happening is when you execute these certain Java Programs they are failing to find the Java runtime (because you deleted them?) Do you currently have a version of Java installed, perhaps you should go to java.com: Java + You and download the latest Java Runtime Environment. Then try again. EXE4J_JAVA_HOME is a last resort in the loaders attempt to find a java runtime. I recommend not having to set this in the first place, but if you want to: 1. Obtain the path to your Java runtime folder, such as C:\Program Files (x86)\Java\jre6\bin\java.exe. Search for java.exe if such a path does not exist. 2. Click on the Start menu, right click on "Computer". Choose "Properties" then on the left choose "Advanced System Settings". 3. On the popup, choose "Environment Variables". 4. At the bottom, under "System Variables" click on "New...". 5. The Variable name is "EXE4J_JAVA_HOME" the value is the folder you noated in point 1. 6. Accept this and try again.