Ecommerce Error-- Store Module -- Fatal Error

I am in the process of installing Ecommerce on a Drupal installation.

I get a fatal error which flows back to the store module when I try to move to the Activation .

The error is:
"
ECOMMERCE Fatal error: main(): Failed opening required 'sites/default/modules/ecommerce/store/store.inc' (include_path='E:\Program Files\EasyPHP\php\pear\') in e:\program files\easyphp\www\cms\sites\default\modules\ecommerce\store\store.module on line 4

Look for help in resolving this error.

Thanks in advance
garry_bs@yahoo.co.uk

Garry