So, you happen to have an old PC lying around. It still boots, and it can browse the internet and load up your favorite social network, but the last years haven’t been too kind to it. You bought it in 2012, and it has started to show its age. It hangs, lags a lot, fails to run some software, and constantly crashes. At this point, if you’re using it as your main PC, it might be tempting to throw it away and build a new one.