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first step open a cmd prompt and type java -version
should say something like
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
if not itll give some other message, if the java.exe isnt found the path environment is screwed up, if the runtime isn't found the classpath or the java registry is screwy
try uninstalling all the java stuff you can see in the control panel and then reinstalling it, but use the cmd prompt instead of double clicking it
( start / run ) type cmd "enter" to get to a cmd prompt
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