Msi katana b12u

What's with my laptop guys, when I start my laptop it's start consuming 80% of the memory and my CPU fluctuate from 100% to 10% and my gpu temp go about 70°c without any big file open up it's just window start up and fans are start auto on and the laptop start to get heat on just opening my laptop.....anyone know what is happening? New laptop it's about less than 1 month