Generally, upgrading laptops is difficult for two reasons. First, the CPU and GPU need to be in sockets. Many times the CPU and/or GPU are soldered to the motherboard. Second, laptops are built with a specific thermal profile. If you can replace the CPU or GPU, the new parts can't run hotter, because the laptop is not built to handle the extra heat. Since this is an old laptop, you're probably better off replacing it with a newer laptop (used or new).