Windows Vista SP1 RC

Windows Vista Service Pack 1 RC is now available through Windows Update. Experience the WU based Vista SP1 installation by following 4 simple steps. Windows Vista SP1 RC distributed through Windows Update will be applicable to Windows Vista machines that are running on any of the 36 languages supported by Vista RTM. If you already installed the Service Pack to your machine by using the standalone package, you must uninstall before you scan Windows Update for Windows Vista SP1.

Windows Vista Service Pack 1 RC - All Language Standalone Package
Windows Vista Service Pack 1 RC Public Availability Program
Windows Vista Service Pack 1 RC1 for x64 Based Editions - All Language Standalone Package