When I ran the installer for SQL Server 2008 Books Online (download here) I got an error.
This installation package cannot be installed by the Windows Installer service. You must install a Windows service pack that contains a newer version of the Windows Installer service.
How Vista is not auto-updated with the latest installer is beyond me, but here's what you have to do.
- Download the new installer package.
- That page says you need to use wusa.exe to install the package, but if you just double-click on what you downloaded it will do that automatically.
- Restart. (Yes, I tried not restarting, but it doesn't work until you restart).
- Bask in brand-new installer glory.