use the Database Manager Plugins - in the SQL textbox run this querry whenever you want:

sql:  delete from #__users where group_id=32000 and now()-registered> 2592000

need a look at the second expression

Someone help me.

1. with folder LANG, open common.php

2. Replace this

lang_encoding' => 'iso-8859-1'


lang_encoding' => 'utf-8'