The Microsoft Web Platform Installer (Web PI) is a free tool that makes it simple to download, install and keep up-to-date with the latest components of the Microsoft Web Platform, including Internet Information Services (IIS), SQL Server Express, .NET Framework and Visual Web Developer. In addition v2.0, installs popular open source ASP.NET and PHP web apps with the Web PI.
Install the latest version of the .NET Framework. This includes everything you need to work with ASP.NET.
IIS and Extensions
Install the latest version of IIS, including latest IIS Web extensions like IIS Media Services.
Install the latest version of SQL Server 2008 Express. This includes both the database engine and tools.
Visual Web Developer
Install the latest version of Visual Web Developer Express, Our full featured free web development tool.
Extra and Goodies
In addition to everything above, the Web PI also includes the latest community version of PHP for Windows.