HTTPWebRequest Mimic IE (Windows Authentication)

Hello, just a quick question, im trying to log on to a page within our intranet that uses Windows Authentication to work out the current user and allows them into the system, (ASP.NET 1.1) I can't get my HTTPWebRequest to authenticate it's just booting me out any ideas? im setting the .Credentials to be the username extracted from User.Identity.Name but it's not enough. Below is the code.

(u) is a URI Object

VB Code:

Dim wRequest As HttpWebRequest = HttpWebRequest.CreateDefault(u)
        wRequest.Credentials = Profile.GetCredential(Nothing, "")
        wRequest.PreAuthenticate = True
        wRequest.UnsafeAuthenticatedConnectionSharing = True
        wRequest.UserAgent = " Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"
 
        Dim wResponse As HttpWebResponse
        wResponse = wRequest.GetResponse

Ideally I'd like to mimic the Request so the server thinks it's an IE window
Thanking in adv

Sam