I am currently using the Marmalade SDK on my Windows machine to build an app. I am trying to test the app on an iPhone, and downloaded the iPhone Configuration Utility in order
Steps:
Uninstall just the Apple Mobile Device Support
Extract iPhone Configuration Utility
with any zip utility
Install only AppleMobileDeviceSupport64.msi
( because other one will not install)
I had the same problem and found the answer on one of the Apple forums. It is recent problem for those running 64-bit Windows and updated iTunes to latest 12.1 version.
This iTunes version replaces 32-bit Apple Mobile Device Support with 64-bit version which iPCU doesn't support as it is 32-bit.
The way to resolve it is:
Screenshot for your convience
Note: If you still have to use iTunes, you'll have to use 12.01 version until lazy asses from apple fix that.
Edit: Apparently they are not lazy but selfish pricks. iPCU does not exist anymore. It was replaced with Apple Configurator which was not released for Windows.
Try to restart Apple Mobile Device service http://support.apple.com/en-en/HT203188