tab delimited local user import and group assignment

Good day all,

I have been banging my head against the wall on this one...  I have powershell 3.0 and am trying to create a script to import 420 users into a local server.  The script is getting various errors while adding the user to the group.  I have followed a few different threads and it doesn't seem to workout.

Here is sample data:

User    Pass
1-Installer    MyPassword1
Acton    MyPassword1

These are the links that I have been using to come up with this version of code:

http://social.technet.microsoft.com/Forums/en-US/winserverpowershell/thread/9d8bc8e8-8059-42fe-bb7d-2c9ecb3b6cb3

http://richardspowershellblog.wordpress.com/2008/04/17/local-users-and-groups/

They are the foundation, but I have been researching for a long time now and I think I have hit the end...  I am using the Powershell ISE to debug it and I get the following 2 errors with slight different variations of the code:

Exception calling "Add" with "1" argument(s): "A member could not be added to or removed from the local group because the member
does not exist. (Added a sleep 10 to see if it needed time to refresh)

The following exception occurred while retrieving member "Add": "The network path
was not found. (This was when I changed the "." to env:computername")

Method invocation failed because [System.DirectoryServices.DirectoryEntry] doesn't
contain a method named 'op_Addition'. (Now this one was generated because I changed the concatenation from a "+=" to just a "+")

So, what I have found to be the problem is the following line:  "$objuser = [ADSI]"WinNT://./" += $_.User" because in the debugger, I do not see the user value being assigned to the $objuser variable.  It just stays blank and causes more errors...

$objgroup = [ADSI]"WinNT://$env:ComputerName/FTPUsers,group" 
$target = [ADSI]"WinNT://$env:ComputerName"
$root = "E:\FTPRoot\"
Import-Csv "C:\test.txt" -delimiter "`t" | ForEach-Object { 
    $userinfo = $_.User
    $password = $_.Pass
	$newuser = $target.Create("user", $userinfo) 
	$newuser.SetPassword($password) 
	$newuser.SetInfo() 
	$newuser.psbase.InvokeSet('AccountDisabled', $false) 
	$newuser.userflags = 65536 -bor 64
	$newuser.HomeDirectory = $root += $userinfo
	$newuser.SetInfo() 
    sleep 10
	$objuser = [ADSI]"WinNT://./" += $_.User 
	$objgroup.Add($objuser.Path) 
    $userinfo = ""
    $password = ""
	}

Any suggestions?

Tico