IIS Express will not start

Question

I\'m just putting this one out there since its a Google Zero-resulter which means I win a prize?

Cannot start IIS Express 7.5 after reinstall from one account, but I

Answer 1

I got this problem after upgrading to Web Platform Installer 5.

The quick fix for me was to also upgrade to Webmatrix 3 (http://www.microsoft.com/web/webmatrix/)