How to fix a laptop that reboots randomly (opens in new tab)

My daughter has had a laptop for two years now. For school. But not just for school: the thing is used for everything (i.e. Minecraft). And if she isn't using it herself, the youngest one is sitting on it. At the end of April, she started complaining: my laptop just shuts down! I took a quick look: what kind of junk is all this? VPN software and whatnot (long story, another blog). I explained that if you put all sorts of junk on your laptop, it becomes unreliable. I uninstalled a few things a...