The improvements include:

• Modularization is implemented behind the scenes in Windows 7 code. Some of the benefits include:
• Simplified addition of drivers and other updates
• Simplified development of service packs
• Simplified implementation of multiple languages


• Window 7 installation is done from a Windows Imaging Format (WIM) image file.
  
  Some of the benefits of Windows Imaging Format files:
• Ability to add and remove components directly from the image file
• Ability to add updates directly to the image file
• Ability to add and remove files directly from the image file
• A single image for multiple hardware platforms
• A single image file for multiple images with varying configurations
  For more information about the Windows Imaging Format (WIF), visit:
  http://technet.microsoft.com/en-us/library/cc749478(WS.10).aspx.


• Windows 7 uses a single XML-based answer file to perform automated installations.
  
  Windows System Image Manager (WSIM) is the only tool used to create and edit answer files for Windows 7 installation.
  For more information about the Windows System Image Manager (WSIM) tool, visit:
  http://technet.microsoft.com/en-us/library/cc722301(WS.10).aspx.


• The installation scripts can be used to automate installation tasks to ensure that they are performed in exactly the same way each time.


• File and Registry Redirection. When applications attempt to write information to the Windows folder or restricted parts of the registry, Windows 7 redirects these requests to a virtual Windows folder or virtual registry location. This "tricks" the application into running, without requiring users to have elevated privileges.