Hi,
I was able to pin down the issue after uninstalling every extra driver/application that I have installed after the Windows 10 reset.
The issue seems to be caused by a 3rd party application called Duet Display, DuetSetup-1-5-2-1.exe. This application allows you to use your iPad as a 2nd monitor.
I am pretty sure Duet Display is what is causing the issue as after uninstalling it everything works as expected.
I finally have an answer to this and it is nothing to do with the graphic driver or the Windows 10 April update.
Thanks for your replies and help,
Gabe.