Windows 8.1 Pro – CPU Usage Stays at 100%

About an hour ago, I noticed that my laptop had gotten noticeably slower. My laptop is extremely fast, so this extreme decrease in performance prompted me to look at the task manager. In the task manager, the histogram showed that my CPU usage was at a steady 100%. I wasn't sure what the cause of the problem was, so I decided to reboot my computer. After doing so, I went into the task manager, and in a few moments, the histogram was once again showing a steady 100% CPU usage. I have no explanation for the problem, as it seems to have started on its own. I am using my mom's laptop now to write this. Could someone please explain to me what could have caused the problem, and more importantly, what I can do to solve it? My laptop has conveniently turned into a brick right before school starts back up again for me when I need it the most.

Edit: So I powered on my laptop on which this problem is occurring, and during the boot-up process, I unplugged the display cable for my double monitor setup. After booting up, I opened the Task Manager, and saw that everything was just fine. My CPU was not showing a steady 100% anymore. A few seconds later, I got these two messages, in order in which they are displayed…

I checked in my task tray (or whatever they call that thing next to the clock), and MySQL notifier, which normally starts on its own, was not open. I tried starting it manually, but I got the same result. It appears that the issue with my CPU had something to do with it. Now I just have a different problem: something is wrong with MySQL. Even though the question was not originally about this, I would appreciate it if someone would help me solve the problem anyway.