IIS 7.5 PHP failure “The FastCGI process exited unexpectedly”

Question

I\'ve been attempting to get PHP working with IIS 7.5 and have hit a bit of a roadblock. Whenever I try to load the page I get the following error:

\"HTTP Error 500.

Answer 1

I had this problem when I upgraded PHP 5.4.14 to 5.5.3 (32-bit).

To fix it I had to install the Visual C++ Redistributable for Visual Studio 2012 Update 3

I found out that I needed this DLL by running php --version from the console when my web pages no longer loaded after the upgrade. Which then revealed that I needed the MSVCR110.dll, that comes with the 32-bit VS redistributable update from MS. Since I have optional updates turned off in Window Update, I did not get it automatically.

They also come in different flavors (32-bit, 64-bit, and ARM) 32-bit is what worked for me.