In order to download Windows Vista SP1 through Windows Update copy and paste everything below into notepad and save it as SP1BetaRK_ext.cmd It may take some time before Windows Update recognizes your computer as a valid SP1 target. Also it may or may not have to install up to 3 additional updates (one at a time in sequence) before it even shows you SP1. @echo off reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\VistaSp1 /v Beta1 /t REG_SZ /d a2c3c14a-9586-4d37-9aaa-79fbd64069d2 /f reg add HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\WindowsUpdate\VistaSP1 /v Beta1 /t REG_SZ /d a2c3c14a-9586-4d37-9aaa-79fbd64069d2 /f echo Vista SP1 registry key has been set. Please check for updates in Windows Update. Please note: I learned the hard way that SP1 won't install through Windows Update if you built your own Vista DVD with vLite. You have to install with an untouched retail or OEM disk.