Permissions in folder

Just wondering if its normal to have 4 groups/users having permissions. the unknown account was there before resetting and as well as after resetting and im not sure if someone has a backdoor into my pc or not

i also cant open certain things after trying to give myself full admin before reset so now i cant open things like the calc, clock, photos or even outlook from the dashboard but i can open file explorer and linkedin

Been a while since I was here, but great to see the Tech Support Forum is still going strong!

In the last week I've bought a new prebuilt PC, I will post the full specs at the bottom of this post. All seemed well until I opened up a couple of games in steam, Sniper Elite IV and later Spider-Man remastered. On four occasions now the PC has rebooted itself without warning. No BSOD, but just straight off and back on again.