Windows Vista Service Pack 1 (SP1) RC should be used to update a PC running Windows Vista RTM to Windows Vista SP1. This standalone package will install SP1 as well as any applicable pre-requisite packages.
The All-Language standalone package supports installations on all versions of Windows Vista with one or a combination of the 36 Windows Vista languages installed.
Uninstall Instructions for Windows Vista SP1 RC:Windows Vista SP1 RC does not support build-to-build upgrades. If you install this build to your system, you need to uninstall it before moving to the final Vista SP1 RTM version.
Prerequisite packages (KB935509, KB937287 and KB938371) for Window Vista SP1 are permanent and unistall of these packages is disabled by design. During the installation of Windows Vista SP1 RC, the installer determines whether or not you need the prerequisite packages and updates your system automatically.