android - Appium: Couldn't start the appium server in Windows -

i having 2 version of appium. 1 installed on windows/program files , other version .zip extract.

i not able start appium server , got below error -

error: couldn't start appium rest http interface listener. requested port in use. please make sure there's no other instance of appium running already. 

start windows task manager pressing ctrl+alt+del. under processes tab kill 'node.exe' process. try start appium server again