I have recently been renovating an old computer that I found really cheap. I have replaced the psu, cpu, gpu and RAM. I have installed a clean version of windows 10 from a backup drive, and with minimally few programs the CPU has been sitting at 99% whenever the computer is on. The original model is an HP 700-406 desktop unit, and I am using an AMD Athlon X4 880K cpu (An older unit, but the only FM2+ we have in stock). I don't know what the problem is or how to fix it. It is definitely not any programs running, the computer is still running on a fresh windows 10 with a few benchmark programs. Does anyone have any insight as to what the problem could be?