This week we're releasing two more prerequisites for Windows Vista Service Pack 1 that will be coming later this quarter. We wanted to let you know about them because they are both marked as Important updates (and they’re a little different than usual).
KB938371 is a multi-component update that supports the successful install of SP1 and allows it to be uninstalled. KB937287 updates the Windows Vista “Servicing Stack.” Both updates (required before SP1 will be offered via Windows Update) are being made available now to reduce the number of reboots and make installation of the service pack easier.
Even if you're not ready to install the service pack once it's released, you'll want to install these updates because they'll help increase performance and reduce failures for the installation of other updates.