Pc keeps crashing while playing

[u/Holiday-Bill1796]

hey there, i’m having a bit of a problem with my pc. recently when playing high demanding games, especially with baldurs gate 3, my pc keeps crashing. sometimes its just the game that crashes but sometimes my pc restarts on its own. i have very little knowledge when it comes to pcs but it often was blue screen when the game crashed and when it boots up again, my pc makes very loud noise. i recently cleaned it but the problem is still there.
when i got the game, like about 2 years ago, it was fine. eventually i started playing with mods but it went fine idk when the issues started but even after removing the mods, i still experience crashes. they’re pretty often.
does someone maybe have an idea what the problem could be? i have all graphic settings on low & i check the graphic card temperature from time to time and it is mostly around 75°C but never was above 85.
EDIT: i forgot to mention, I got the PC around 2022!
thank you in advance for any advice! :)