asp.net webpage downloaded instead open in browser from iis in windows xp service pack3

Question

Hello Guys

I Developed One Web Application in VS2008 .Net Framework 3.5.

And I want to host this on Client System on IIS and Run on Local Network

I Installed Component on PC are framework 3.5 ,Crystal report, Sql Database

  

Client System Configuration : Windows XP version 2002,Service Pack 3,IIS 5.1

Problem : When I host WebApp. on IIS and Browse webpage then this Page not open in Browser

                 and auto download this page