A registry is where all your files are kept that are needed to run your computer. It's different from your personal files, although these may also be stored in the registry because you opened them. You see, the registry is a registry of all your computer activities from the moment you boot up to the time you close your PC. Since the registry has limited space, it can get too full to function properly. It's just like your stomach. If you're full, then you will not be able to eat another bite, and if you do, something terrible is going to happen.
What you need is a registry repair program. This is a software you can download easily from the internet. You have a choice of buying one or getting one for free. Naturally, nothing is really free in this world, so if you choose the "free software" then be ready for the consequences.
If you want a one-stop solution, you will avoid the free software, and buy a verified software. After all, it will not even cost more than $ 30, and you can use it for as long as it is updated.
Without a good type registry repair software, you will end up spending as much as one hundred dollars every time your PC crashes due to a faulty registry.