Help Fixing Upgrade gone wrong

Hi,

I was on 7.0.0.7 and stupidly tried to upgrade to 7.0.1.5 without reading the instructions. I replaced the files and it didn't work so I overwrote them again with the original (7.0.0.7 - I took a backup before I did it) files but I still get an error page - it says this -

Notice: Undefined index: settings_name in /home/fekcorg1/public_html/maincore.php on line 66

Notice: Undefined index: settings_value in /home/fekcorg1/public_html/maincore.php on line 66

Notice: Undefined index: default_timezone in /home/fekcorg1/public_html/maincore.php on line 73

Notice: date_default_timezone_set() [function.date-default-timezone-set]: Timezone ID '' is invalid in /home/fekcorg1/public_html/maincore.php on line 73

Notice: Undefined index: locale in /home/fekcorg1/public_html/maincore.php on line 98

Warning: include(locale//global.php) [function.include]: failed to open stream: No such file or directory in /home/fekcorg1/public_html/maincore.php on line 205

Warning: include(locale//global.php) [function.include]: failed to open stream: No such file or directory in /home/fekcorg1/public_html/maincore.php on line 205

Warning: include() [function.include]: Failed opening 'locale//global.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/fekcorg1/public_html/maincore.php on line 205

Notice: Undefined index: login_method in /home/fekcorg1/public_html/maincore.php on line 247

Notice: Undefined index: login_method in /home/fekcorg1/public_html/maincore.php on line 249

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 848

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 849

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 850

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 851

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 852

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 853

Notice: Undefined variable: userdata in /home/fekcorg1/public_html/maincore.php on line 854

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 41

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 44

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 48

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 49

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 50

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 51

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 59

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 62

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 65

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 66

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 67

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 68

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 69

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 71

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 73

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 74

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 77

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 80

Notice: Use of undefined constant THEME - assumed 'THEME' in /home/fekcorg1/public_html/includes/system_images.php on line 83

Notice: Undefined index: opening_page in /home/fekcorg1/public_html/index.php on line 20

Anyone have any idea how to salvage it?

Many Thanks in advance