I've cloned an existing 1.3.7 shop and changed the template. I thought I had it working correctly but for some reason when submitting the blank create account page it just reloads the page and fails to arrive at create account success.

I've had a good read on this forum and checked all the create account files I can find and cant seem to find the answer.
I've run the debugging tool and here are the results.

[22-Feb-2010 07:35:00] PHP Warning: main(includes/modules/create_account.php): failed to open stream: No such file or directory in /hsphere/local/home/waycool/totalcontrol.com.au/includes/modules/pages/create_account/header_php.php on line 17
[22-Feb-2010 07:35:00] PHP Warning: main(includes/modules/create_account.php): failed to open stream: No such file or directory in /hsphere/local/home/waycool/totalcontrol.com.au/includes/modules/pages/create_account/header_php.php on line 17
[22-Feb-2010 07:35:00] PHP Warning: main(includes/modules/create_account.php): failed to open stream: No such file or directory in /hsphere/local/home/waycool/totalcontrol.com.au/includes/modules/pages/create_account/header_php.php on line 17
[22-Feb-2010 07:35:00] PHP Warning: main(): Failed opening 'includes/modules/create_account.php' for inclusion (include_path='.:/hsphere/shared/apache/libexec/php4ext/php/') in /hsphere/local/home/waycool/totalcontrol.com.au/includes/modules/pages/create_account/header_php.php on line 17
My header_php file is identical to the working site and line 17 is:
include(DIR_WS_MODULES . zen_get_module_directory(FILENAME_CREATE_ACCOUNT));

I have no idea where to go from here but feel that I'm very close to an answer and that it is likely a missing file or error with an upload.

Everything else on the site works correctly including log in for existing customers and checkout.

Any ideas would be greatly appreciated!

Cheers