i can't remove the sidebar

i needed to add an eCommerce plug in on my website, the plugin is woocommerce.1.6.5.2 and it is really good and it works great with the theme, but there is only one thing; in the product pages i can’t remove the sidebar, it doesn’t show on the right as it is supposed to, it shows after the page ends on the right, like there were 2 pages under each other, and i can’t remove it from these pages even when i make the default page full width

so any ideas? thanks