WooCommerce Fatal error

Hi. This is my first wordpress site using the woocommerce plugin. I get the following error when i go to the site, however, if I refresh the page the error goes away and the site functions normally.

Fatal error: Class 'WC_Product_Simple' not found in D:\Hosting\10686736\html\wp-content\plugins\woocommerce\classes\class-wc-product-factory.php on line 62

I did try uninstalling and re-installing the wooCommerce plugin. The site is CollierNY.com. If anyone can help with troubleshooting I’d appreciate it.
Thanks in advance.

http://wordpress.org/extend/plugins/woocommerce/