Ah that guidance is outdated. First you want to get PHP build 5.2.6 or greater as that's a lot faster than previous versions. Secondly you want to run PHP with FastCGI - it's available as a download for IIS 6 and is built in to IIS 7.

Really worth checking out The Official Microsoft IIS Site and get all of the information here - PHP on IIS : The Official Microsoft IIS Site