Engine crashes while opening any file on version 4.2.1

Here’s a round-up of my problem:

  • Opening any .uproject in version 4.2.1 causes the engine to crash during the loading screen. Even a new blank project.
  • However opening a project made with 4.1.1 works perfectly fine in 4.1.1 so i tried…
  • Opening my project (made in 4.2.1/4.2.0) in 4.1.1 wich also produces the same crash.

The crash reporter only tells me an !Id

I already tried:

  • to reinstall version 4.2.1
  • to reinstall unreal engine 4 as a whole
  • to update my graphics card drivers
  • to reinstall .NET framework

Remarkably the same project in the same version appears to run on every other PC without any problems.

Any idea how to fix this?

The crash report:
[1]:

I reinstalled Windows. Now it works but still UE 4.2.1 seems very buggy to me. I cant recommend to update from 4.2.0