configure.php paths - sanity check please

I have a new install that's giving me "500 Internal Server Error" messages (nothing in the PHP logs) and I'd like to start by having someone check some of my path settings. I don't have a public_html level, the root dir I see via FTP is my main page contents as '/'.

/store/includes/configure.php:
define('HTTP_SERVER', 'http://www.MyDomain.com');
define('HTTPS_SERVER', 'https://protected.MyISP.com/MyDirAtISP/store');
// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'false');
I'm thinking the "/store" is incorrect there? I have SSL off so that shouldn't be causing my current problems, and when I add (shared) SSL I don't want the entire site to be secure, just the store (and perhaps store/admin).

Here are the WS settings:
define('DIR_WS_CATALOG', '/store/');
define('DIR_WS_HTTPS_CATALOG', '/store/');

/store/admin/includes/configure.php:
define('HTTP_SERVER', 'http://www.MyDomain.com');
define('HTTPS_SERVER', 'https://protected.MyISP.com/MyDirAtISP/store');
define('HTTP_CATALOG_SERVER', 'http://www.MyDomain.com');
define('HTTPS_CATALOG_SERVER', 'https://protected.MyISP.com/MyDirAtISP/store');
Again, I'm thinking the "/store" part of the path is incorrect.

And the admin WS settings:
define('DIR_WS_ADMIN', '/store/admin/');
define('DIR_WS_CATALOG', '/store/');
define('DIR_WS_HTTPS_ADMIN', '/store/admin/');
define('DIR_WS_HTTPS_CATALOG', '/store/');
I believe these are correct.

Thanks!

define('HTTPS_CATALOG_SERVER', 'https://protected.MyISP.com/MyDirAtISP/store');
Again, I'm thinking the "/store" part of the path is incorrect.

You are correct. Remove the /store from the HTTPS paths.