I am going to say this up front. I am new to this technology. I have a nopcommerce site and am having trouble getting to it to work on it. So, if you don't mind, after you've stopped laughing, please write me back.
What kind of trouble are you having? Is there a URL that you can provide us so that we can take a look at the error message that you are getting? How did you install nopCommerce, from your Control Panel's app installer or by downloading the source code and uploaded a compiled copy to your hosting space yourself?