How to tell if your cpu is not working right

[Guest]

My CPU Usage keeps reaching 100% than my computer restarts/crashes every time I do certain things online such as watching videos, apps, and games!

 

[hell_storm2004]

A little more info on your system specs and the problem should be helpful, you know.

 

[jsc]

Including:
Is this a new build?
Did this problem just start?
If it is a new problem, did anything happen or change just before the problem showed up?