i am accessing report manager which is on webserver , i am accessing it from my machine which is in the same domain as webserver ,, when i use url in explorer it prompts for username and password to log in to webserver

1. i am logged into my machine using a domain account which has been given full permissions in report manager (which is on webserver)

2. i cant find virtual directory as it doesnot exist ijn SQL 2008 as it uses some http.sys

I am stuck over here please help me, IDK how to sort it out ??