Unable to Install Citrix XenDesktop VDA 2.x-5.6 on physical machines with Windows 7 with WDDM Drivers

Here is a good reason why you should upgrade to Citrix XenDesktop Feature Pack 1

/Poppelgaard

Symptoms

Users are unable to install XenDesktop 5.6 and lower versions on physical Windows 7 computers with WDDM display drivers.

Cause

XenDesktop 5.6 and lower versions do not support the use of the VDA on an operating system with the WDDM display driver.

Resolution

Upgrade to XenDesktop 5.6 Feature Pack 1 and use the Remote PC feature.