This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
on XP Right Click MyComputer > Properties > Advanced Tab > Environment Variables > under user Variables section, add or edit PATH > with the location of the install c:\program files\java\jdk1.5.0_6\bin\. That should be it.