Windows Vista SP1 is available for download
Windows Vista SP1 is now downloadable via Windows Update. Get the full story from Nick on the Vista Team Blog.
Get the x86 standalone package @ https://www.microsoft.com/downloads/details.aspx?FamilyID=b0c7136d-5ebb-413b-89c9-cb3d06d12674&DisplayLang=en.
Get the x64 standalone package @ https://www.microsoft.com/downloads/details.aspx?FamilyID=874a414b-32b2-41cc-bd8b-d71eda5ec07c&DisplayLang=en.