Can't access site, permissions problem

[mfsumption]

Previously, I had created a domain and copied a DNN 3.2.2 install into the httpdocs dir and set the necessary NETWORK SERVICE account permission. When I tried to access the default.aspx page from a browser, I would get the Windows login dialog. Why, I dunno. So, I deleted the domain and recreated it. Before doing all the DNN stuff, I decided to just try the Plesk test page. So, I browsed to the index.html page and it came up just fine. But, when I clicked on the ASP or ASP.NET test page links, I get the Windows login dialog again. Can someone please tell me what the heck is going on. I've been dicking with this for over a week now. I appreciate any help. Thanks.
Michael