Posted on: May 11, 2016, 10:15:07 AM
If you haven't updated your Joomla in a while you have left your site open to hacks due to out dated security. I don't know what version of Joomla you are running, but in the more recent versions of Joomla you can update Joomla from Components/Joomla Update. However, if your site has already been hacked simply updating the site will not change much, you would need to clean the entire site or ask your host to restore it to a backup from an earlier date before upgrading.
You can also find updates directly from joomla.org. You would have to contact any third party extensions you are using to see if they have updates and what the procedure is in updating their products.