Auto-start Service on Windows?

Windows XP Pro
elasticsearch is 0.16.2

java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)

How do I make this an auto-start Service on Windows?

Walter