Problems getting PHP to work (IIS5/XP Pro)

Now I tried this on the Windows list but didn't get any replies. I also found an old thread on another site that Rasmus had replied to and I tried that suggestion but no luck. I just ran the PHP installer and it set it up as a cgi I guess. I'd do the other way if I could find complete instructions. I tried the ones in the file included with the zip but it gave another error. I don't understand why I'm having issues, I installed PHP 4.1 and below just fine in this very same set up. However, I am receiving the following error: No input file specified. I have tried some of the suggested methods of fixing this but have not been able to solve it. Does anyone have a link or some info on how to fix this? Jeff