Having issues debugging website with VS2008

I am attempting to debug a website on Windows XP. To be more specific, I am trying to debug an install of SiteFinity CMS. This CMS was installed via Microsoft's Web Platform Installer. It was installed to the default location of C:\Inetput\wwwroot.

The first error I got when attempting to debug the website with VS2008 was relatively straightforward and I solved it by changing the authentication of the web application in the IIS manager. Here is that error:

The second error, the one that has me stumped, is not 开发者_运维技巧really an error message at all. When I go to debug the website now, I get an authentication prompt from localhost:80:

I tried putting my windows user credentials in, but that did not work. Any suggestions on what user I should try, or better yet how to eliminate the need to enter credentials at all?

Does your windows user have permissions for this site ?