I have worked in technical support and customer service for the past 5 years, so I know what its like to be very hesitant to tell a customer "no" or "its not going to work" or "I can't help you." In fact, more often than not responses like that will only get you in trouble with your superiors. You have to lie outright and convince the customer that, despite their extreme stupidity and the fact that their computer is 10 years old, there is indeed a chance of getting everything on their computer working perfectly again.
But in many corporate IT departments, you can actively solicit requests for fixing things, and then deny said requests without any logical explanation, and spend the time you'd otherwise be spending on fixing that problem watching a movie or ordering pizza. Which you can afford, since you get paid more than the price of the pizza during the time it takes you to eat it.
This isn't the case with all IT departments, of course, so if you work in IT and this description doesn't apply to you, then good for you. And I offer my condolances.