Valorant system error?

I recently got a computer from a friend but everytime I play valorant and only valorant, I get this error. It could happen when I boot or mid match during a 1 hour timespan of playing. When it happens all I see is the valorant tab blacked out and when I alt f4 nothing happens. I have tried tabbing out and nothing happens either all I see is what is attached. All I can do is either wait it out (5-8 mins normally) or turn off my pc.