cpu stuck at 800 mhz

I have an Acer Aspire 5 with i5-8250u mx 150. My CPU is stuck at 1.58 Ghz. I tried to fix it with intelppm from regedit by setting the start value at 4, but it just got it to 1.80 Ghz. It was working at 3.40 Ghz. Is it the bdProchot? I didn't use it at heavy task so I don't think it was...

After i installed my SSD Adata su650 240GB in my Laptop (Toshiba Qosmio x770) i installed win 10 on it it was slow i looked up the Task manager and saw that my CPU is running at not even 800mhz so i formated the ssd using another Computer and installed win 8 on it. It ran normaly with 2.2Ghz...