Once you install a new hardware on your PC, the system searches its driver to be able for it to function. The drivers depend on the device that you are installed. If that device contains a CD when you bought it, you can use it to install the driver of the device that you installed or else search the internet for the Applicable Driver.
You will notice that when you run the driver that come from the CD or downloaded, it will turn you into a user interface containing the step by step guide in how to install the driver. But sometimes, you need it to install manually.
