If you try to run VP-CART on your system and get a pop-up requiring User-Id/password, then the authentication setup is wrong but easily fixed.
When you are attempting to browse a Web page, the following error is displayed:
You are not authorized to view this page
You do not have permission to view this directory or page using the credentials you supplied.
HTTP 401.2 - Unauthorized: Login failed due to server configuration
Internet Information Services
The Solution is to start Internet Information Services, select the directory and allow anonymous access. Use:
Start/Control Panel/Performance and Maintenance/Administrative Tools/Internet Information Services.
Then click to you see webs structure
Right Click on the Directory, in this case, VPCART, select Properties
Check Anonymous Access