I'm having a massive problem getting a Joomla site to work at root level on a site I'm working on. It works in the subfolder but I'm getting a zilliion errors when I try to move it to root level. The latest is "Fatal error: Class 'JException' not found"

So, what I'm trying to do is upload a zipped backup of the site to the root level and unzip it there because I think the problem is being caused by FTP file corruptions, but I can't find any options to do that in my CP (I'm with streamlinenet.co.uk) and the scripts I've found that do it are a little cofusing for someone not versed in PHP like me.

Can someone recommend an easy to follow technique for unzipping on remote servers?

Thanks, Rich