interop.shdocvw.dll not working in client machines

[aaru24x7]

Hi I created an ASP.NET application in VS 2005, IIS 5.1 (which would login to a site like gmail.com after taking the user & password details), using vb.I am using interop.shdocvw.dll to invoke the internet explorer through which i am navigating the elements of the html document and passing the values(User Name And Password). When I run this URL in the windows 2003 server machine (local host where application is installed) it works fine ,but when i am trying to access the same url from other client machines ,it is promting me to enter username & password for the windows 2003 server. How do I bypass the user / password validation for windows 2003. arumugam_mr