Windows 10 LoL (TM) client has stopped working. Game crashes 5 seconds after the match begins

It does not matter what game mode I play, after character select and the standard loading screen. The game then starts and 5..4..3..2..1.. League of Legends (TM) client has stopped working. Windows wants to submit a crash report.

I am currently running the current release of Windows 10 Beta. (LoL has worked for months up till now)

I have:

Run the repair utility for League Run system restore points to roll back to the last date I played a successful game. Updated as well as downgraded the drivers for my Nvidia 550ti graphics card. Updated where available the drivers and software for my mouse and keyboard. Uninstalled and reinstalled DirectX. Uninstalled League of Legends deleted all remaining files after the uninstall. I also deleted all registry values via regedit Reinstalled League of Legends with the most current installer available via the website.

So far none of this has worked. I am willing to reload the OS but only as a last resort. League has been working fine in Win 10 and I have been running it as a full time OS for months with no issues since its initial release.

If anyone else has or had this issue I would be sincerely grateful for your solutions.