Hello Paul,
You do not change any instances of the site_name, this is a language variable in the admin->Language Manger, then under Edit language in the file General/Homepage, you will find the languge variable site_name, that's why we say just search the forums for questions, if you search the forums here for site_name you will know how to change it in only one location and it will automatically change in all pages. Here is the answer in our FAQ forum for this:
Where to change Site_Name to my company name  FAQ forum: http://www.mewsoft.com/cgi-bin/forum/forum.cgi?action=Forums&Forum=13&Lang=English You will find in your hosting panel cPanel ->Bacup your website backup files that you can restore.
If you still want to reinstall your site, then you have these options, 1)-ask the hosting company to restore your website from the last backup they have. 2)-download the backup that you/we create in your cPanel hosting control panel, then extract on your PC and reupload only the templates and languge file that you messed or all of them, do not upload files under /data folder. 3)-Order a one hour custom work ($50) and we will reinstall it for you, please note we do not manage customers sites. Thank you
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