Windows 7, by default, install drivers from trusted publishers without prompts. You can also update manually directly by visiting the Driver sites of Manufacturer. Here is a list, listing below some of the driver update site.
ATI Radeon drivers for Windows 7
C-Media AC97 drivers for Windows 7
Creative Sound Blaster Drivers for Windows 7
HP Computer System Drivers for Windows 7
HP Printer/Scanner Drivers for Windows 7
Intel Motherboard Drivers for Windows 7
Intel Chipset Drivers for Windows 7
Lexmark Printer Drivers for Windows 7
Microsoft Hardware Drivers for Windows 7
NVIDIA GeForce/ION Driver for Windows 7
Realtek AC97 Driver for Windows 7
Realtek High Definition Driver for Windows 7
You can also visit Microsoft Download Center for an exhaustive list of available Drivers.
Source : @ TheWindowsClub