Microsoft, Powershell, Windows Server 2008, trying to modify a local user, getttting "Exception calling "SetInfo" ...( Exception from HRESULT: 0x8007007B)"

I am trying to run the simplest of Powershell scripts in Windows Server 2008.
I an trying to change the FullName property of a local user. This script
works fine on XP (the local user "testuser" exists on the on WS2K8 server I'm
running on):

$user = [ADSI]"WinNT://./testuser,user"
$user.Fullname="Test User"

When I hit the SetInfo() line, I get this error:

Exception calling "SetInfo" with "0" argument(s): "The filename, directory
name, or volume label syntax is incorrect. (
Exception from HRESULT: 0x8007007B)"

If i do $, it dumps the list of properties and values
with the new value reflected, i just cant actually write the info.

Googling had turned up nothing useful.
$user = [ADSI]"WinNT://./testuser,user" 
$user.Fullname="Test User" 

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that works perfectly for me... are you logged in as administrator or using an elevated shell?

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Bessemer-HDAuthor Commented:
That was it.  Even though I am an admin on the box, I had to launch PowerShell via "ru nas administrator".  Thanks!
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