screen freezing

[|tda| fatal]

Hello all,

So I have been getting this issue quite often now when my screen just locks and there's nothing I can do to fix it. Some have suggested pressing alt + enter but that doesn't work for me. I try to /q or control + alt + del to task manager and end process and it does not end the process, I have to restart my computer every time. This has cost me quite a few deaths and lots of wasted time.

I play in windowed mode, im not sure if thats helpful?