Add path to windows environment manually
I believe you did not add path to environment.
You may double check by yourself. You can
open control panel, double click "system" icon.
from system property, click "Advanced" tab,
at the bottom click the "Environment variables" button
from the "system variable", select "path", click "edit" button
add the path (java compiler) to the end of the "valuable value".
I hope this help