here is a process kill function for windows:
<?php
function win_kill($pid){
$wmi=new COM("winmgmts:{impersonationLevel=impersonate}!\\\\.\\root\\cimv2");
$procs=$wmi->ExecQuery("SELECT * FROM Win32_Process WHERE ProcessId='".$pid."'");
foreach($procs as $proc)
$proc->Terminate();
}
?>