Thanks Teo, I try couple of things and eventually get it work, of course, one of them is reboot, then I go to reporting service configuration, and change the port from 80 to 8080, or 2345, all of sudden, it works, but when I change back to 80, it doesn't work, so I change back and forth, then all of sudden, it works, I am still not so sure exactly the problem, but at least it is working now, I guess the new OS (Window 2008) and Reporting Services without IIS make things a little bit interesting.
Don