I have installed woocomerce it was all working fine but then when I went to update a product like normal it gave me this Error 324 (net::ERR_EMPTY_RESPONSE):. This occurs when i ACTIVATE/DEACTIVATE Plugins ADD/UPDATE a page,post or product and also carn access woo commerce system status as it says it doesn’t exist.

Things I have done.
-Deactivated the plugin
-Deleted the Plugin
-Deactivated other plugins and enabled them one by one
-But it only occurs when woocommerce has been installed.

Theme WordPress Twenty Twelve, Using latest version of theme, woocommerce and wordpress.