Obtaining installation state of Visual Studio .NET programmaticall

The following article describes how to obtain the installation state of Visual
Studio .NET programmatically.

Typically, you can examine a file or a registry entry to determine
whether you have a version of Microsoft Visual Studio .NET, or of any
program, already installed on your computer. You can also determine
the version information programmatically by using Microsoft Windows
Installer functions such as the MsiQueryProductState function. The
MsiQueryProductState function takes the product code as the input
parameter and then returns the installation state of the program.


http://support.microsoft.com/default.aspx?scid=kb;EN-US;884468


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