I would suggest getting Speed Fan. Ignore anything in the program you find complex and don't alter the parameters, just install it and look at the "readings" for GPU HPU and Core.
I run some serious graphics on my machine and the temps are all below 45C just to give you a benchmark. Speed Fan is small and free: http://download.cnet.com/SpeedFan/3000-2094_4-10067444.html
This will flag up if there is an overheating issue that needs to be addressed, as wheelie is suggesting with your fan. It does look like an overheat, it could also simply have been one of the /config /run updates tying your machine in a knot. Since it happened following an official update I doubt a virus is at the root. ::IMPORTANT::
just open up your laptop and start messing with it. You can destroy it if aren't careful. We are (electrically) charged and if you emit any static discharge you can fuck your circuitry right up.
Ideally you would not touch ANY part of the inside of your machine. Ideally you would wear a static band in case you do. However as long as you don't touch anything inside it and keep
a hand (leg, nostril w/e keep contact with it) on the metal part of the casing to ground yourself it should be ok. But it is worth mentioning because it has happened and it would be rather upsetting yes?
Make sure to google your machine type and refer to a video to do it also there are plenty online.