Is it a custom PC or pre-built? If it is the latter, what make and model? You can usually find out which parts it has based on that info although some models come with different CPUs, GPUs and other parts but they are usually the same motherboard and all the drivers will be on the manufacturer's site. What operating system does it have? If it is Windows, you can find out what some of the parts are in the device manager. Windows also installs most of the drivers but if you need something like a GPU or wifi card driver, the simplest way is to open up the case and look at each part.