PHP 5, IIS 6, no love....

Ok, so I decided to go the easy route with PHP 5 and simply use the installer. Fresh installation of Win2K3, IIS works just fine, and I take the next step of running the PHP 5 installshield app. I updated the permissions as the installer recommends at the end of the installation. Everything appeared to be good. So I created a simple test script and it wouldn't run. I checked the permissions to make sure they matched those recommended by the installer -- no difference. I moved the php5ts.dll file over to \windows as suggested by the manual install -- no difference. I set the iusr_ account to have read and read/execute permissions on the PHP folder -- no difference. I fiddled with different settings in IIS -- no difference. Whenever I attempt to run a script via IE, it hits me with a standard 404, "file or directory cannot be found" error. Of course, I *KNOW* the files are there so that's not the issue. Suggestions?