Microsoft has released the standalone version of the Windows Vista Service Pack 1 (SP1) for 32-bit (434MB) and 64-bit (726MB) systems. Both versions of SP1 contain five languages which are English, German, French, Spanish and Japanese. SP1 is designed to fix a lot of issues, and bugs that were discovered after the release of the OS, no major new features were added.
This version of SP1 is intended for system administrators of companies, organizations, or government IT departments to make available to their users. Microsoft prefers that people download this service pack through the Microsoft Update service. The download is also smaller if you use the online service.