Appium node.js server can not start: Could not pre-launch appium: Error: 'java -version' failed. Error: spawn ENOENT

I try to Launch Appium 1.3.7 version on windows, to inspect my app's elements, etc. but this is what I get everytime

>     > Starting Node Server
>     > info: [debug] Starting Appium in pre-launch mode
>     > info: Pre-launching app
>     > error: Could not pre-launch appium: Error: 'java -version' failed. Error: spawn ENOENT
>     > 
>     > 
>     > Node Server Process Ended

What can cause this ? how to get rid of it. help please.