In this case, jdk is not installed or the system variables are not configured . Set the following in the system variables:
Variable name: JAVA_HOME Variable value: C:\Program Files\Java\jdk1.6.0_25
Variable name: CLASSPATH Variable value: .;%JAVA_HOME%\lib;
Variable name: Path Variable value: %JAVA_HOME%\bin;
If you download eclipse , you can go directly to the official website http://www.eclipse.org/downloads/ for free, genuine