Dell Inspiron N5010, Upgrade from 7 to Win 8.1 x 64, 6 GB ram

Because I have had a heating issue and a fan running more, I looked at my task manager and found that "host process for Windows tasks" was using the highest cpu and at times the only cpu usage.

Also, I have two of those terms "host process for Windows tasks"in task manager but only one in my desktop.

So I have 3 questions;
1- does this process running higher than any other tell you anything?
2- why is one of the duplicate entries the only one consuming resources of all the entries?
3- why are there 2 similar entries in the laptop and only one in the desktop?

Thank you