Huge FPS drop. (PC)

So, recently I’ve had problems running the MCC on my pc. On the first day it was fine. No FPS drops, but by the second day I began to notice a small FPS drop, but I assumed it was just cause I had other things running at the time so I closed them, but performance was still slower than before. now is the third day that I’ve had the game and now the game is running at around 4-7 FPS basically making it unplayable even with nothing but steam and the MCC open. and its only noticeable after I press enter to reach the main menu after starting the game up. its slightly better when running without anti-cheat reaching about 10-15 FPS. I’ve tried everything I know to help with the problem but to no avail. pls help.