Try factory reset and if it's still that way call it a defective unit. Why should you fix a new PC?
I bought a computer a few weeks ago, its a lenovo Y520 brand new.
Since the first day I've been surprised to see that it was kind of slow, until now I was just using it for basic tasks and it was still slow.
I tried to play games on it, even basics one and its not even possible.
I have not installed anything on it, I checked tutorials to solve that and tried everything I could find such as desable things from skype, chrome, windows search etc etc but still my computer is constently running 100% disk usage.
I read that it is a problem from windows 10 but i tried a lot of solutions and none worked.
Do you guys have any idea ?