Windows 10: why does fortnite crash and restart my windows PC?

every time i launch fortnite it reboots my pc or gives it a bsod.i have opened cmd and tried the following command:SFC /SCANNOW that didn't fix iti have verified the files ALOTi have even updated my bios and it still doesn't workPLEASE HELP

:)

 

My pc freezes and crashes while playing fortnite

As the tilte suggests i have been experiencing my pc freezing and crashing while i play fortnite (havent tested any other games). To begin with ive been experiencing fortnite crashing mid game for the past week. I updated drivers windows 10 and unistalled fortnite and installed it again. After the windows update i think that the problem expanded to my pc freezing and crashing. To save you some time i have Autoruns from a previous crashing issue

 

My pc freezes and crashes while playing fortnite

also we have shifted our focus on fortnite crashing while my main issue is that my pc crashed while playing fortnite and rebooted 3 times since yesterday

 

all games crash!

I suggest you run rthdribl > http://www.daionet.gr.jp/~masa/archives/rthdribl_1_2.zip
Increase the window size step by step and watch your vga temps permanently.
What happens?
If it crashes, run at stock speeds as suggested before and retry.

P.S.: When your system locks, does the display signal turn off after a time?
Stuttering sound or no sound at all when freezing?
What X1800XT model do you own exactly?