# Add a domain user to a local group on the remote computer  
$localGroupName = "Asministrators" #Group Name of Admins here
$domainName = "DN=YourDomainName,DN=com" #Enter Your Domain Name Here
$strFilter = "(&(objectCategory=Computer)(!userAccountControl:1.2.840.113556.1.4.803:=2))"
$objDomain = New-Object System.DirectoryServices.DirectoryEntry("LDAP://$domainName")
$objSearcher = New-Object System.DirectoryServices.DirectorySearcher
$objSearcher.SearchRoot = $objDomain
$objSearcher.PageSize = 1000
$objSearcher.Filter = $strFilter
$colResults = $objSearcher.FindAll();

foreach ($objResult in $colResults)
{
$objItem = $objResult.Properties;
$computerName=$objItem.name
$user_name=[regex]::Split($objItem.name,"-")[0]
([ADSI]"WinNT://$computerName/$localGroupName,group").Add("WinNT://$domainName/$user_name")  
}