Why is fortnite crashing my pc?

Hello so I installed fortnite a couple of months ago but it´s crashing every time? At the begining it crashed in the first like 10 minutes in game and then it closed and I got a crash report. Now it just freezes completely and i have to restart my whole computer. I can´t even open the task manager. I just want to play with my friends so if there is anything that i can do please tell me. And also I want to mention that I don´t think that my pc is to bad for it because I have a much better pc then my brother and it´s working totally fine for him.

Hello, thank you for reporting your issues with Fortnite. Although the crash reporter window directs you here, Answerhub is meant for issues relating directly to Unreal Engine 4 rather than our game titles. For assistance with Fortnite, please visit the following link:

http://fortnitehelp.epicgames.com/

If you cannot find the solution to the problem you’re encountering, please use the Email Us link on that page to contact Player Support for further assistance.