When you install a new Plug & Play compatible device, Windows 7 checks the driver store first to see if an appropriate driver is available. If yes, installation proceeds immediately & automatically.
If Microsoft Update detects that you are using an older version of a particular Driver, it will immediately offer to update the driver with a compatible newer version.
If no compatible one is available, it will prompt you to search for driver software. Windows 7, will by default, install drivers from trusted publishers without prompts. In other cases, you will be presented with a consent dialog box.
Windows 7 Drivers list
You can also always update manually directly by visiting the mother sites. I’m therefore listing below some of the driver update sites, which I came across.
Microsoft Hardware Drivers for Windows 7
To install Intel Drivers, see the Intel Drivers Updater.