Task Scheduler .vbs pass windows authentication?

Hello,

I am trying to set up a scheduled task using a .vbs that simply opens an .aspx that resides on the same box (WinServer2008 R2 Standard SP1).  The .aspx updates a database nightly.  The problem I am having is that the website is using Windows Authentication and requires credentials.  How can I pass credentials via the .vbs, or is there a better way to go about this?  Anonymous access is not an option, although the process works when it is allowed.

 Call PTRBilling()
 Sub PTRBilling()     
     'On Error Resume Next
     'Declare variables 
     Dim objRequest 
     Dim URL 
     Set objRequest = CreateObject("MSXML2.ServerXMLHTTP.6.0") 
     'Put together the URL link appending the Variables. 
     URL = "http://xxxxxx.org/PTRBilling.aspx" 
     'URL = "https://www.google.com" 
     'Open the HTTP request and pass the URL to the objRequest object 
     objRequest.open "GET", URL, false 
     'Send the HTML Request 
     objRequest.Send 
     'Set the object to nothing 
     Set objRequest = Nothing
     WScript.Echo "Done"
 End Sub

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Thanks,
Andrew