What Is Cpu And Ckd Units Of Various Cars Is Rivatuner Safe To Download?? And Does It Affect The Performance Of Ur Pc?

Is rivatuner safe to download?? and does it affect the performance of ur pc? - what is cpu and ckd units of various cars

because I downloaded .. then install ... after they forced me to my computer and change the settings on my new-start anti-virus ,....... and another thing, it says that my processor is running slower ... (I've the exact message, but I remember something about the speed of my CPU)