Microsoft Knowledge Base Article 254078 contains the following summary:

This article describes the steps to add Original Equipment Manufacturer (OEM)-supplied drivers to Windows installations. This article only includes drivers that are typically installed during graphical user interface (GUI)-mode Setup or after Setup by Plug and Play enumeration. This permits you to pre-load OEM Plug and Play drivers that you can use if the associated hardware is added to the system later.

This article describes how to add OEM Plug and Play drivers in the following situations:

Unattended Setup
Sysprep Setup
Remote Installation Service (RIS) installations
Riprep images
Existing Windows installations

For additional information about adding OEM supplied mass-storage devices during text-mode Setup, click the following article number to view the article in the Microsoft Knowledge Base:

220845 Adding Third-Party or Updated Driver During Windows Setup