To install Tiki via the Web Platform Installer (WebPI), you need a Windows version where IIS 7 is available (Windows 7, Windows Server 2008, most Windows Vista editions). The install may be slightly smoother using Internet Explorer. It will not work on Windows Server 2003 and Win XP.

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More information at:
http://www.microsoft.com/web/gallery/Tiki.aspx

At first, WebPI installs the dependencies for Tiki to be able to work (PHP, MySQL), then, it sends you over to the Tiki installer (tiki-install.php) where you follow the usual steps.

When you are in WebPI, make sure to make a note of your database information (user & password) that you set as the Tiki installer will need this.

If you are upgrading, you'll be required to enter the DB password. If you forgot it, you can look in C:\inetpub\wwwroot\tiki\db\local.php to retrieve it

When it comes to sending mail from PHP, the following configuration of Sendmail may be necessary: http://forums.iis.net/t/1165177.aspx. Alternatively, when the installation finishes, you can go to Admin > General and set up Tiki to send mails via SMTP instead (check settings given by your ISP / email provider).