Most of the time you dont even care about them after they are installed. Alot of people do because after some time your small SSD harddrive (or C: partition) is full. When investigating whats going on you might find a big folder named:
C:\Program Files\NVIDIA Corporation\Installer2
This folder contains all versions of the Nvidia drivers you have EVER installed. Its not the drivers, its just the installfiles. You can them without facing any upcoming problems.