Help! Major admin fubar, lost cats and attributes

Hi

I have a major problem, I have all of a sudden lost my admin/categories and attributes, every time I access them I get a error displayed.

With my limited experience, I have checked for missing files, and re-uploaded possible faulty files but no fix.

Can someone who is code savy plz help me out:cry:

Get this category error:

Warning: main(includes/modules/prod_cat_header_code.php) [function.main]: failed to open stream: No such file or directory in /home/sites/juliestoys.co.uk/public_html/admin/categories.php on line 12
 
Warning: main(includes/modules/prod_cat_header_code.php) [function.main]: failed to open stream: No such file or directory in /home/sites/juliestoys.co.uk/public_html/admin/categories.php on line 12
 
Warning: main(includes/modules/prod_cat_header_code.php) [function.main]: failed to open stream: No such file or directory in /home/sites/juliestoys.co.uk/public_html/admin/categories.php on line 12
 
Fatal error: main() [function.require]: Failed opening required 'includes/modules/prod_cat_header_code.php' (include_path='.:/usr/share/pear') in /home/sites/juliestoys.co.uk/public_html/admin/categories.php on line 12

This is attributes error:

Warning: main(includes/modules/products_previous_next.php) [function.main]: failed to open stream: No such file or directory in /home/sites/juliestoys.co.uk/public_html/admin/attributes_controller.php on line 66
 
Warning: main(includes/modules/products_previous_next.php) [function.main]: failed to open stream: No such file or directory in /home/sites/juliestoys.co.uk/public_html/admin/attributes_controller.php on line 66
 
Warning: main(includes/modules/products_previous_next.php) [function.main]: failed to open stream: No such file or directory in /home/sites/juliestoys.co.uk/public_html/admin/attributes_controller.php on line 66
 
Fatal error: main() [function.require]: Failed opening required 'includes/modules/products_previous_next.php' (include_path='.:/usr/share/pear') in /home/sites/juliestoys.co.uk/public_html/admin/attributes_controller.php on line 66

I have checked.
admin/categories.php
includes/modules/prod_cat_header_code.php
includes/modules/products_previous_next.php

Any help appreciated.:thumbsup: