[RESOLVED] PHPstorm - Access Denied after configuring CLI Interpreter

[RESOLVED] The web installer (repeatedly) installed the wrong version of the Web Platform Installer (v3). Once I got the correct one in place (v5) I stripped out my manual installation of PHP7 and used the WPI to install 7.2.9. From there i reconfigured PHPstorm and all is right with the world once more. I'll definitely be buying this platform instead of Webstorm!

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I was originally evaluating Webstorm until I found out that PHPstorm was what i really needed. After installing that, I had to manually install php 7.1.7 on my windows 10 laptop because... because Windows 10. That's installed and working fine through the standard default setups for IIS on localhost:80. At present when i run my index.html page, it works absolutely fine, just like in Webstorm. When I rename the page to index.php to add a simple text file include, i get Access Denied. No error numbers or other information... just Access Denied.

Can I uninstall the IIS since PHPstorm has its own built in server?
I think it may be interfering, because i had to manually edit the permissions for wwwroot just to create a version check file for my php installation.