When starting my game with BattlEye enabled, my system crashes with a bluescreen (BSOD).
First of all, ensure that Driver Verifier is disabled on your system as it is currently known to cause problems with BE. You can find how to do so here: https://support.microsoft.com/en-us/help/244617/. To disable it please clear all of its settings and reboot your system. Secondly, please fully update your system's BIOS. If that doesn't help and the crashes persist please contact BattlEye support directly so they can investigate your issue.
This answer is copied from BE's FAQ and slightly adapted to be Unturned-specific. Click here to visit the BE support page.