Crashing on launch

Hi,
I am using Unreal Engine 4.9 previews for learning purpose.
I made a small set and did lighting to it.
Everything was going smooth.
I tried adding sky light and build it.
It stated to crash.
Now It crashes even without any project (from Epic games Launcher)

I tried many fixes as mentioned on your website like cpoying project on desktop, deleting config, saved folder etc.
But nothing is useful.
Kindly look into matter and do needful.
Thanks in advance
Regards
Darshan

Duplicate of Crash opening project - Unknown exception - code 00000001 - Platform & Builds - Epic Developer Community Forums