param([Parameter(Mandatory)] [String] $userName,[Parameter(Mandatory)] [String] $groupName)

$passwordBase64 = Read-Host
$password = [System.Text.Encoding]::UTF8.GetString(
    [System.Convert]::FromBase64String($passwordBase64))

if(Get-WmiObject -query "SELECT * FROM Win32_UserAccount where LocalAccount='True' and name = '$userName'"){
    $user = [ADSI]"WinNT://$($env:COMPUTERNAME)/$userName,user"
}else{
    $cn = [ADSI]"WinNT://$($env:COMPUTERNAME)"
    $user = $cn.Create("User",$userName)
    $user.UserFlags = 66049
    $user.Put("description", "Local Account")    
}

try{
       $user.SetPassword($password)
       $user.SetInfo()
}catch{
       $errorMessage=$_.Exception.Message 
       
       if($errorMessage -like "*Passwords may not contain the user's samAccountName *"){
           throw $_.Exception.Message           
       }elseif($errorMessage -like "*The password does not meet the password policy requirements.*"){
           $errorMessage
           secedit /export /cfg c:\secpol.cfg
           (gc C:\secpol.cfg).replace("PasswordComplexity = 1", "PasswordComplexity = 0") | Out-File C:\secpol.cfg
           secedit /configure /db c:\windows\security\local.sdb /cfg c:\secpol.cfg /areas SECURITYPOLICY
           rm -force c:\secpol.cfg -confirm:$false

           $user.SetPassword($password)
           $user.SetInfo()

           secedit /export /cfg c:\secpol.cfg
           (gc C:\secpol.cfg).replace("PasswordComplexity = 0", "PasswordComplexity = 1") | Out-File C:\secpol.cfg
           secedit /configure /db c:\windows\security\local.sdb /cfg c:\secpol.cfg /areas SECURITYPOLICY
           rm -force c:\secpol.cfg -confirm:$false
       } 
}

$computer = [ADSI]("WinNT://$($env:COMPUTERNAME),computer")
$admins = $computer.psbase.children.find('Administrators')
$members = $admins.psbase.invoke('Members') | %{$_.GetType().InvokeMember('Name', 'GetProperty', $null, $_, $null)}
if($members -contains $userName){
}else{
    $group = [ADSI]"WinNT://$($env:COMPUTERNAME)/$groupName,group"
    try{
        $group.psbase.Invoke("Add",([ADSI]"WinNT://$($env:COMPUTERNAME)/$userName").path)  
    }catch{
        $_.Exception.Message
    }
}