I think laptops are very prone to failure. That is the cost of their compactness. The keys need to be thinner, the battery is expected to deteriorate over time, it will accumulate dust and will eventually heat up. If you want to try to give your old laptop a second life, you can probably bring it to a technician, have them clean the inside of the laptop, and let them do a fresh install of the system. It should be faster than before, but definitely not faster than what you have now. You can use it as a multimedia station or something.