The problem

Upgrade your computer to windows 8.1 and upon logging in you get an application crash from Citrix, wcfrun32.exe.

The solution

You need to upgrade to the XenDesktop 7.1, Windows Receiver 4.1.

This can be downloaded from here:

http://www.citrix.com/downloads/xendesktop/receivers/receiver-for-windows-41.html

Download, install and the application will stop crashing