As long as that horrid statement "the customer is always right" is allowed to be said, people will do anything they can to blame the problem on someone else. As someone who has done computer repair for a lot of my life, I've seen the other side of your story very often, and trust me, it gets a LOT dumber. Not just because of the crazy things they'd say (like thinking Vista is going to make Pentium 3 system better, or, Internet Explorer being the most secure web browser... seriously), shenanigans people got themselves into (like a computer that was overheating due to a layer of thick smelly goo covering the entire interior, where the CPU fan couldn't even spin 100RPM - don't smoke, kids), but also the products someone managed to upsell them (like an 80 year old grandma with a Crossfire-enabled gaming PC who only checked email and played Christmas-themed solitaire). The good part was how people very rarely ever accused me of doing something wrong, but, they still would grasp at straws and find something else to blame (like a virus that doesn't exist, or a teen installing a game). It amazes me how much people cling onto stereotypical computer issues from the 90s. The most common being "if I delete my music library, will that make my computer faster?"