JOOMLA HIGH EXPERT : Update website Joomla version from 1.6 to last version + install 2 plugins

Hello, We are a small webagency and we might give you regular job if you do well this job for us, see our ratings we post lot of projects Here is our need : Our client website in Joomla 1.6 have problems : - missing core files, frontend is working very well but backend we cannot install any plugin, written error messages missing lot of core files. Because this website have been hacked recently So you need update Joomla from 1.6 to LAST version, so that all missing core files will be uploaded and last version will prevent hacking problems And also on this website you must install 2 plugin : akeeba backup and any plugin to give possibility to upload in cms pages, audio files with player Note : plugin akeeba backup is already installed but not working since website have been hacked, so you need uninstall then install last version Thx