[CRASH]Mid game SYSTEM EROR

1.So I was playing League all day fine then randomly the game crashed mid game. I could get back into the game for about 15-20 seconds and it crashed again i got leave buster from this and demoted i have not installed anything new on my pc...

"A critical error has occurred and the process must be terminated. This is usually due to the result of incompatible third-party software being installed on your machine.

Please disable any overlay, streaming, or experience 'enhancement' software. Additionally, you may need to whitelist this application with your installed security software.

If you need further assistance, please visit the support website for help."