Killing an Internet Explorer process started by Powershell

dear all,

i using following code start ie process , navigate website.

$process = start-process "c:\program files (x86)\internet explorer\iexplore.exe" http://www.nu.nl -passthru

then want close process use

$process.kill()

this works beautifully when 1 internet explorer window open. if there internet explorer window open throw following error

exception calling "kill" "0" argument(s): "cannot process request because process has exited."  @ line:2 char:1  + $process.kill()  + ~~~~~~~~~~~~~~~      + categoryinfo          : notspecified: (:) [], methodinvocationexception      + fullyqualifiederrorid : invalidoperationexception  

how can close internet explorer window opened powershell session?

thank you

$ie = new-object -com 'internetexplorer.application' $ie.visible = $true $ie.navigate("http://www.nu.nl")  

and close :

$ie.quit()

Windows Server  >  Windows PowerShell