The worst antivirus!

Hello Slava, could you please elaborate your issue so that it will give us a better understand of your issue. Thank you.

THIS SHIT CAUSES THIS ERROR:
How Do I Fix Avgmfx64.sys Bluescreen (BSOD) Errors?

Okay, I use Windows 8.1. I can't even log in via safe mode because of you

Hello Slava, could you please elaborate your issue so that it will give us a better understand of your issue. Thank you.