So I just bought a prebuilt PC about two months ago, mainly for gaming, it's worked perfectly fine until suddenly today, while I was playing with my friend when suddenly everything started lagging horribly, I thought it was the game but it persisted after I turned off the game and rebooted my PC, just now I tried turning on my PC and I immediately shut down every program that opens on startup and the lag stopped, and I tried opening everything one by one to see if it was one program, but my pc just lags if anything is open, so I'm just stuck at the desktop, looking in the task manager everything I open up says "very high" power usage, and programs will randomly take up 100% GPU