I agree. I think humans can never be contented. We can see that from the rich, where there is always a new technology/car/something that they need to have; or a better year in sales for the company. But it is as you said, it's how we tackle these setbacks/roadblocks/challenges that matter. If what one is doing isn't giving them joy, then maybe they need to find something else to do.

As for the computer, if you're not tech savvy enough, I would suggest having it checked first before buying anything. I think as long as the CPU isn't the bottleneck, then you can just upgrade the different parts. You'll never know, it might just be a dusty PC problem.