Reverse Engineering SQL Server 2008 Database in Toad Data Modeler 4.2

I am just getting started with Toad Data Modeler 4.2, and I want to reverse engineer a SQL Server database. However, when I open up the Reverse Engineer Wizzard, in the Select Data Source, I only see Oracle database options. How can I connect to my SQL Server database? See attached screen shot.

If you go to Add Remove/Programs in Control Panel and select the Modify option for Toad Data Modeler, you can install the other database drivers. Looks like this was installed with one of the Oracle suites and by default only the Oracle drivers are installed.

Thank you!