Failed to create com object

[sharath]

Hai,
I'm trying to add a new user. But i'm getting fatal error.
This is my program....
Adduser() ;
function Adduser()
{
print("creating user \n");
$obj = new COM("WinNT://.");
try {
$user = $obj->create("user", "test");
$user->Description = "New User" ;
$user->setinfo();
} catch( exception $e ) {
print("error ........ \n");
$user = new COM ( "WinNT://./test");
}


Below are the error message that I got from this program .

Fatal error: Uncaught exception 'com_exception' with message 'Failed to create COM object `WinNT://./test': The group name could not be found.
Stack trace:
#0 C:\Program Files\php\adduser.php(14): com->com('WinNT://.
/test')
#1 C:\Program Files\php\adduser.php(2): Adduser()
#2 {main}
thrown in C:\Program Files\php\adduser.php on line 14

Can you solve my probelm........?
Thanks in advance..
Regards,
sharath.