Look in your Task Manager which process (details) is causing the problem (sort on processor %)

How to Open the Windows Task Manager:

1) You’re probably familiar with the three-finger salute—Ctrl+Alt+Delete. Up until Windows Vista was released, pressing Ctrl+Alt+Delete brought you directly to Task Manager. Since Windows Vista, pressing Ctrl+Alt+Delete now brings you to the Windows Security screen, which provides options for locking your PC, switching users, signing out, and running Task Manager

2) If you prefer mouse to keyboard, one of the fastest ways to bring up Task Manager is to right-click any open space on your taskbar and choose “Task Manager.” Just two clicks and you’re there.

In the task manager details, system idle process has the highest CPU percentage, usually above 85% but in the processes tab the CPU is constantly at or close to 100%. 

Sorry my mistake: In the processes tab you can see which process is causing the CPU load.
P.S. You can click on the process to get more details about it.

 I had the same problem on my newly purchased Dell Inspiron, I called the Dell support, and was told it is a S/W problem and not under warranty, it would cost $99 to debug it. I uninstalled all the garbage that came with it and just downloaded the chrome browser, it is slightly better. I also called ThinkEdu support where I purchased the laptop, they were even worse.

I actually had to revert back to my 12 year old laptop (not a brand name) which performs much better. We are such doling out money for these useless gadgets

After posting this problem on the forum, I received a request to provide the service tag which I complied. Let' see if they can help, if it solved the issue I will post it. Since it appears to be a known issue on this brand of laptop.

Dell support never got back with me, just as well.  I found them very inept anyways and generally with a bad attitude specially when they are unable to help you.