4.12 fresh install fails to launch

Editor stops launching at 70% every time. System requirements are met and pc is plugged in. Tried restarting, verifying, OpenGL, running as admin and then reinstalled it. It’s installed on drive M which hopefully is not the problem. DxDiag has Assertion failed messages towards the bottom.

How do I fix this situation?
link text

Reinstalled to C and cleaned up reg files. Is UE4 always so buggy or is this a bad release?

Issue fixed by going to C:\Users\YOURUSERNAME\AppData\Local\UnrealEngine and removing the folders 4.12 and common (note: I through them into a temp folder I made in the same directory). Relaunched, it lagged at 49% but pasted 70% and it through the allow firewall access message. 4.12 and common folders are replaced by the launcher and the editor launched successfully.

Thank you for the fast support!
Your welcome.
GG