Create new local admin from computer list

#Define variables
$computers = Get-Content C:\scripts\computers.txt
$username = "<username>"
$password = "<password>"
$fullname = "<full name>"
$local_security_group = "Administrators"
$description = "Description"
$errorLog = "C:\scripts\errorList.txt"

Foreach ($computer in $computers) {
    $users = $null
    $comp = [ADSI]"WinNT://$computer"

    if (Test-Connection -Quiet $computer -BufferSize 16 -Count 1)
    {
    #Check if username exists
    Try {
        $users = $comp.psbase.children | select -expand name
        if ($users -like $username) {
            Write-Host "$username already exists on $computer"

        } else {
            #Create the account
            $user = $comp.Create("User","$username")
            $user.SetPassword("$password")
            $user.Put("Description","$description")
            $user.Put("Fullname","$fullname")
            $user.SetInfo()

            #Set password to never expire
            #And set user cannot change password
            $ADS_UF_DONT_EXPIRE_PASSWD = 0x10000
            $ADS_UF_PASSWD_CANT_CHANGE = 0x40
            $user.userflags = $ADS_UF_DONT_EXPIRE_PASSWD + $ADS_UF_PASSWD_CANT_CHANGE
            $user.SetInfo()

            #Add the account to the local admins group
            $group = [ADSI]"WinNT://$computer/$local_security_group,group"
            $group.add("WinNT://$computer/$username")

                #Validate whether user account has been created or not
                $users = $comp.psbase.children | select -expand name
                if ($users -like $username) {
                    Write-Host "$username has been created on $computer"
                } else {
                    Write-Host "$username has not been created on $computer"
                }
               }
        }

     Catch {
           Write-Host "Error creating $username on $($computer):  $($Error[0].Exception.Message)"
           $computer | Out-File $errorLog -Append

           }
     }
     else
     {
           Write-Host "$computer is offline."
           $computer | Out-File $errorLog -Append
     }
}