I don't know how many times I've done this before, but here I am again, fixing yet another of our family's computers. Obviously this is a case where the reward for a job well done is the privilege of doing it again (and again, and again...)
For this round it's the Lenovo S10 net book belonging to my middle stepson. By the the time it was handed off to me it would no longer boot, let alone flash the Blue Screen of Death. The hard drive was chock full of malware, crapware, trojans, back-doors, viruses, and file system corruption. Repair was off the menu; salvaging his music, homework, and chat logs became the priority.
I pointed out to all of our offspring that their parents have gone for years without major catastrophes befalling our machines, yet they scarcely go a year before a major intervention is required. Not that this is likely to change any behaviors. That was just venting.
What does work is taking away their administrator rights as the price for future support.