If I am not misstaken;

Add Account[computer/user] to Group
 Code:
Dim $strDomain,$strComp,$strGroupName
Dom $oDomain,$oGroup

$strDomain="Workgroup"
$strComp="jdoe"
$strGroupName ="Administrators"

$oDomain = GetObject("WinNT://" + $strDomain)
$oGroup = $oDomain.GetObject("Group", $strGroupName)
$oGroup.Add ("WinNT://" + $strDomain + "/" + $strComp)
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as long as it works - why fix it?
If it doesn't work - kix-it!