Form Security Issue

I am an ASP.Net web programmer and have built very few 'forms' in my career. My problem is that I need to fire a web page (VB.Net 2.0) off from Either a scheduled task or create a bat file or application that I can tie to the scheduled task. The problem is the Network Security (active directory) credenitals window pops up when the web page gets hit. Is there ANY way I can pass this info in and avoid the popup - or must I get up at 5:00 in the morning and run it manually or totally redesign to be non-web based?

TIA

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