Be advised that Virtue Mart uses the global configuration settings to determine if new user registration is allowed and follow the account activation policy. You can moderate these settings via the Global Configuration settings of your Joomla
From the Global configuration page, please refer to the System tab on the top and apply the desired settings
Allow User Registration
If this option is set to YES a user/customer must be registered to your site before being able to checkout (even if the customer might not recognize it due to silent registration). VirtueMart provides an enhanced Registration Form where customers can leave their account and shipping data. When register using this form, they are automatically added to the Joomla user list.
Use New Account Activation
If NO is applied, new customers are having a streamlined checkout process and don’t have to activate their new account by checking their email and restart their checkout!