I have a big problem opening http://localhost/ on Windows 7 (beta). I installed this os and everything went great; when I installed Wamp I saw that localhost is not working
Have you try the iis? Go to Control Panel->Programs and Features->Turn Windows features on or off (side bar). Try installing or reinstalling the Internet Information Service. I've a windows 7 with iis, with .net and php, and it works great...