In desperate need of the Geek Squad

Alright, so my computer keeps shutting down with the message above coming up. I've done numerous spyware/adware/virus checks on my computer, and cleaned up any issues that have been found. I also have an external hard drive which holds any non-essential file or application.

So my question is, what in the blue hell is wrong with my lap top? How can I prevent this from happening again?