Microsoft WebMatrix can be downloaded from: http://www.microsoft.com/web/webmatrix/
It may be that before you install WebMatrix, you be required to download the Microsoft Web Platform Installer: a free tool used to install various Microsoft products, including WebMatrix.
You then need to follow the installation wizard.
Once you have completed the installation, Microsoft WebMatrix will be included in the list of programs and can therefore be launched.
When you open the program you’ll see the various options you can use to build your website:
WebMatrix you can:
• Customise and publish your personal websites created with MS WebMatrix;
• Use the free applications which come with MS
WebMatrix to create your website;
• Select one of the template sites and customise it based on your needs;
• Publish one of the websites saved on your local computer.
WebMatrix will manage the download, the installation and the configuration of all the available applications.