windows 2003 server configuration

I am running Windows 2003 server and am having trouble configuring. I unzipped php 4.+ to c:\php. I renamed php.ini and put it in C;\windows and configured the extension_dir = c:\php\extensions, doc_root = c:\inetpub\wwwroot, and cgi.force_redirect = 0. I also moved php4ts.dll to c:\windows\sytem32 and then created a ned webservice extension named .php and set the path to c:\php\sapi\php4isapi.dll. Then on to properties of and execute permissions added scripts and executables. Configure tab added .php and set the path to c:\php\sapi\php4isapi.dll and check mark out of verify file exist. Then I went to add content page and added index.php and moved it to the top. I am getting in my web browser with a test file "SERVICE UNAVAILABLE". At other configurations I would get an "NO INPUT FILE SPECIFIED". Now when I am trying to run my script a windows dialogue box is coming up asking me for username and password and I am logged in as administrator. I f you have any ideas where you can help PLEASE understand my pain. Thank you, Jeff Schmidt.