Cool, I had one on Arvixe as well. Their dotnetpanel is quite slow for me. Anyways Go to your websites -> Virtual Dirs -> Create a directory (you can set one up through ftp first if you like) -> Choose a folder where you copied NopCommerce, You should see folders like - Administration - App_themes and the like. Then go back to your newly created virtual dir -> Extensions -> Here you choose ASP.NET 4.0 and make sure you also check the Allow Anonymous Access on the home tab. This should be it. Now comes the database part. But this is usually done by the nopcommerce installer.