Free cell is build into Windows 7 as well, but you need to turn it on.
Click on Windows(Start) Icon
In the search box type:-
Click on the Optiona Features
Once it opens up, expand Games, then tick Free Cell
Press ok, and restart system.
As far as I can determine there are no Windows optional features in Windows 7. At least they do not show up when I click on the start button. They were in Vista however.