Microsoft has released Windows Vista Service Pack 1 RC1 - All Language Standalone Package

Windows Vista Service Pack 1 (SP1) RC1 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.

Download for 32-bit
Download for 64-bit