You may need to install PHP for IIS using the offline installer

1.  Download and install the Microsoft Web Platform Installer to a computer that has Internet access and to the server where PHP is to be installed. from http://php.iis.net
2. Create a local folder for the WebInstallerCache
3. WebPICMD.exe /List /ListOption:All >C:\TEMP\WebPIOffline\Products.txt
4. Review the Products.txt for needed products to install.
   I needed PHP54, PHPManager and SQLDriverPHP54IIS
5. Run the following commands from the computer with internet access
   1. WebPICMD.exe /Offline /Products:PHP54 /Path:C:\TEMP\WebPIOffline
   2. WebPICMD.exe /Offline /Products:PHP54 /Path:C:\TEMP\WebPIOffline
   3. WebPICMD.exe /Offline /Products:PHP54 /Path:C:\TEMP\WebPIOffline
6. Copy the WebPIOffline folder to the server without internet access
7. Run the following commands from the computer without internet access to install the products
   1. WebPiCmd.exe /Install /Products:PHP54 /XML:C:\WebPIOffline\feeds\latest\webproductlist.xml
   2. WebPiCmd.exe /Install /Products:PHPManager /XML:C:\WebPIOffline\feeds\latest\webproductlist.xml
   3. WebPiCmd.exe /Install /Products:SQLDriverPHP54IIS /XML:C:\WebPIOffline\feeds\latest\webproductlist.xml

Products should now be installed and you can continue with your configuration